Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
0fdd1e2c | 28 | #include <sys/mman.h> |
b73401da | 29 | #include <sys/mount.h> |
1e307fab | 30 | #include <sys/resource.h> |
fac6795d DG |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
0fdd1e2c | 34 | #include <sys/wait.h> |
5c827ce0 | 35 | #include <urcu/uatomic.h> |
fac6795d | 36 | #include <unistd.h> |
3bd1e081 | 37 | #include <config.h> |
fac6795d | 38 | |
990570ed | 39 | #include <common/common.h> |
0ba98ebc | 40 | #include <common/compat/poll.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
2f77fc4b | 50 | #include "cmd.h" |
00e2e675 | 51 | #include "consumer.h" |
099e26bd | 52 | #include "context.h" |
54d01ffb | 53 | #include "event.h" |
4771f025 | 54 | #include "kernel.h" |
f1e16794 | 55 | #include "kernel-consumer.h" |
096102bd | 56 | #include "modprobe.h" |
0fdd1e2c | 57 | #include "shm.h" |
1e307fab | 58 | #include "ust-ctl.h" |
00e2e675 | 59 | #include "ust-consumer.h" |
8e68d1c8 | 60 | #include "utils.h" |
4063050c | 61 | #include "fd-limit.h" |
44a5e5eb | 62 | #include "health.h" |
8ac94142 | 63 | #include "testpoint.h" |
fac6795d | 64 | |
ebaeda94 MD |
65 | #define CONSUMERD_FILE "lttng-consumerd" |
66 | ||
75462a81 | 67 | /* Const values */ |
686204ab | 68 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 69 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
70 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
71 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
72 | ||
fac6795d DG |
73 | const char *progname; |
74 | const char *opt_tracing_group; | |
35f90c40 | 75 | static const char *opt_pidfile; |
5b8719f5 | 76 | static int opt_sig_parent; |
97e19046 | 77 | static int opt_verbose_consumer; |
fac6795d | 78 | static int opt_daemon; |
4fba7219 | 79 | static int opt_no_kernel; |
fac6795d | 80 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 81 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 82 | static char *rundir; |
3bd1e081 | 83 | |
a23ec3a7 DG |
84 | /* |
85 | * Consumer daemon specific control data. Every value not initialized here is | |
86 | * set to 0 by the static definition. | |
87 | */ | |
3bd1e081 MD |
88 | static struct consumer_data kconsumer_data = { |
89 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
90 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
91 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
92 | .err_sock = -1, |
93 | .cmd_sock = -1, | |
173af62f DG |
94 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
95 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
96 | .cond = PTHREAD_COND_INITIALIZER, |
97 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 98 | }; |
7753dea8 MD |
99 | static struct consumer_data ustconsumer64_data = { |
100 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
103 | .err_sock = -1, |
104 | .cmd_sock = -1, | |
173af62f DG |
105 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
106 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
107 | .cond = PTHREAD_COND_INITIALIZER, |
108 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
173af62f DG |
116 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
117 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
118 | .cond = PTHREAD_COND_INITIALIZER, |
119 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
120 | }; |
121 | ||
26c9d55e | 122 | /* Shared between threads */ |
099e26bd | 123 | static int dispatch_thread_exit; |
fac6795d | 124 | |
54d01ffb DG |
125 | /* Global application Unix socket path */ |
126 | static char apps_unix_sock_path[PATH_MAX]; | |
127 | /* Global client Unix socket path */ | |
128 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
129 | /* global wait shm path for UST */ |
130 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
131 | /* Global health check unix path */ |
132 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 133 | |
1d4b027a | 134 | /* Sockets and FDs */ |
a4b35e07 MD |
135 | static int client_sock = -1; |
136 | static int apps_sock = -1; | |
2f77fc4b | 137 | int kernel_tracer_fd = -1; |
76d7553f | 138 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 139 | |
273ea72c DG |
140 | /* |
141 | * Quit pipe for all threads. This permits a single cancellation point | |
142 | * for all threads when receiving an event on the pipe. | |
143 | */ | |
76d7553f | 144 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 145 | |
099e26bd DG |
146 | /* |
147 | * This pipe is used to inform the thread managing application communication | |
148 | * that a command is queued and ready to be processed. | |
149 | */ | |
76d7553f | 150 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 151 | |
1d4b027a | 152 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 153 | static pthread_t apps_thread; |
099e26bd | 154 | static pthread_t reg_apps_thread; |
1d4b027a | 155 | static pthread_t client_thread; |
7a485870 | 156 | static pthread_t kernel_thread; |
099e26bd | 157 | static pthread_t dispatch_thread; |
44a5e5eb | 158 | static pthread_t health_thread; |
5eb91c98 | 159 | |
099e26bd DG |
160 | /* |
161 | * UST registration command queue. This queue is tied with a futex and uses a N | |
162 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
163 | * | |
164 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
165 | * this queue and the wait/wake scheme. | |
166 | */ | |
167 | static struct ust_cmd_queue ust_cmd_queue; | |
168 | ||
b5541356 DG |
169 | /* |
170 | * Pointer initialized before thread creation. | |
171 | * | |
172 | * This points to the tracing session list containing the session count and a | |
173 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
174 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 175 | * |
d063d709 | 176 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 177 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
178 | */ |
179 | static struct ltt_session_list *session_list_ptr; | |
180 | ||
7753dea8 MD |
181 | int ust_consumerd64_fd = -1; |
182 | int ust_consumerd32_fd = -1; | |
183 | ||
fb6f1fa2 YB |
184 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
185 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
186 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
187 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 188 | |
2f77fc4b DG |
189 | static const char *module_proc_lttng = "/proc/lttng"; |
190 | ||
5c827ce0 DG |
191 | /* |
192 | * Consumer daemon state which is changed when spawning it, killing it or in | |
193 | * case of a fatal error. | |
194 | */ | |
195 | enum consumerd_state { | |
196 | CONSUMER_STARTED = 1, | |
197 | CONSUMER_STOPPED = 2, | |
198 | CONSUMER_ERROR = 3, | |
199 | }; | |
200 | ||
201 | /* | |
202 | * This consumer daemon state is used to validate if a client command will be | |
203 | * able to reach the consumer. If not, the client is informed. For instance, | |
204 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
205 | * error to the client. | |
206 | * | |
207 | * The following example shows a possible race condition of this scheme: | |
208 | * | |
209 | * consumer thread error happens | |
210 | * client cmd arrives | |
211 | * client cmd checks state -> still OK | |
212 | * consumer thread exit, sets error | |
213 | * client cmd try to talk to consumer | |
214 | * ... | |
215 | * | |
216 | * However, since the consumer is a different daemon, we have no way of making | |
217 | * sure the command will reach it safely even with this state flag. This is why | |
218 | * we consider that up to the state validation during command processing, the | |
219 | * command is safe. After that, we can not guarantee the correctness of the | |
220 | * client request vis-a-vis the consumer. | |
221 | */ | |
222 | static enum consumerd_state ust_consumerd_state; | |
223 | static enum consumerd_state kernel_consumerd_state; | |
224 | ||
ae9e45b3 DG |
225 | /* |
226 | * Socket timeout for receiving and sending in seconds. | |
227 | */ | |
228 | static int app_socket_timeout; | |
229 | ||
fb09408a | 230 | static |
7753dea8 | 231 | void setup_consumerd_path(void) |
fb09408a | 232 | { |
fc7a59ce | 233 | const char *bin, *libdir; |
fb09408a | 234 | |
7753dea8 MD |
235 | /* |
236 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
237 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
238 | * has not been defined. | |
7753dea8 | 239 | */ |
ebaeda94 | 240 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
241 | if (!consumerd32_bin[0]) { |
242 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
243 | } |
244 | if (!consumerd32_libdir[0]) { | |
245 | consumerd32_libdir = INSTALL_LIB_PATH; | |
246 | } | |
247 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
248 | if (!consumerd64_bin[0]) { |
249 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 250 | } |
ebaeda94 MD |
251 | if (!consumerd64_libdir[0]) { |
252 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
253 | } |
254 | #else | |
255 | #error "Unknown bitness" | |
256 | #endif | |
257 | ||
fb09408a MD |
258 | /* |
259 | * runtime env. var. overrides the build default. | |
260 | */ | |
fc7a59ce AM |
261 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
262 | if (bin) { | |
263 | consumerd32_bin = bin; | |
7753dea8 | 264 | } |
fc7a59ce AM |
265 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
266 | if (bin) { | |
267 | consumerd64_bin = bin; | |
ebaeda94 | 268 | } |
72f579ee | 269 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
270 | if (libdir) { |
271 | consumerd32_libdir = libdir; | |
272 | } | |
72f579ee | 273 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
274 | if (libdir) { |
275 | consumerd64_libdir = libdir; | |
fb09408a MD |
276 | } |
277 | } | |
278 | ||
5eb91c98 DG |
279 | /* |
280 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
281 | */ | |
282 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
283 | unsigned int size) | |
284 | { | |
285 | int ret; | |
286 | ||
287 | if (events == NULL || size == 0) { | |
288 | ret = -1; | |
289 | goto error; | |
290 | } | |
291 | ||
292 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
293 | if (ret < 0) { | |
294 | goto error; | |
295 | } | |
296 | ||
297 | /* Add quit pipe */ | |
298 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
299 | if (ret < 0) { | |
300 | goto error; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | ||
305 | error: | |
306 | return ret; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Check if the thread quit pipe was triggered. | |
311 | * | |
312 | * Return 1 if it was triggered else 0; | |
313 | */ | |
314 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
315 | { | |
316 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
317 | return 1; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
0fdd1e2c DG |
323 | /* |
324 | * Return group ID of the tracing group or -1 if not found. | |
325 | */ | |
996b65c8 MD |
326 | static gid_t allowed_group(void) |
327 | { | |
328 | struct group *grp; | |
329 | ||
274e143b MD |
330 | if (opt_tracing_group) { |
331 | grp = getgrnam(opt_tracing_group); | |
332 | } else { | |
333 | grp = getgrnam(default_tracing_group); | |
334 | } | |
996b65c8 MD |
335 | if (!grp) { |
336 | return -1; | |
337 | } else { | |
338 | return grp->gr_gid; | |
339 | } | |
340 | } | |
341 | ||
273ea72c | 342 | /* |
5eb91c98 | 343 | * Init thread quit pipe. |
273ea72c DG |
344 | * |
345 | * Return -1 on error or 0 if all pipes are created. | |
346 | */ | |
347 | static int init_thread_quit_pipe(void) | |
348 | { | |
730389d9 | 349 | int ret, i; |
273ea72c | 350 | |
730389d9 | 351 | ret = pipe(thread_quit_pipe); |
273ea72c | 352 | if (ret < 0) { |
730389d9 | 353 | PERROR("thread quit pipe"); |
273ea72c DG |
354 | goto error; |
355 | } | |
356 | ||
730389d9 DG |
357 | for (i = 0; i < 2; i++) { |
358 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
359 | if (ret < 0) { | |
360 | PERROR("fcntl"); | |
361 | goto error; | |
362 | } | |
363 | } | |
364 | ||
273ea72c DG |
365 | error: |
366 | return ret; | |
367 | } | |
368 | ||
099e26bd DG |
369 | /* |
370 | * Stop all threads by closing the thread quit pipe. | |
371 | */ | |
cf3af59e MD |
372 | static void stop_threads(void) |
373 | { | |
5eb91c98 DG |
374 | int ret; |
375 | ||
cf3af59e MD |
376 | /* Stopping all threads */ |
377 | DBG("Terminating all threads"); | |
54d01ffb | 378 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
379 | if (ret < 0) { |
380 | ERR("write error on thread quit pipe"); | |
381 | } | |
382 | ||
099e26bd | 383 | /* Dispatch thread */ |
26c9d55e | 384 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 385 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
386 | } |
387 | ||
fac6795d | 388 | /* |
d063d709 | 389 | * Cleanup the daemon |
fac6795d | 390 | */ |
cf3af59e | 391 | static void cleanup(void) |
fac6795d | 392 | { |
ef599319 | 393 | int ret; |
6620da75 | 394 | char *cmd = NULL; |
af9737e9 | 395 | struct ltt_session *sess, *stmp; |
fac6795d | 396 | |
1d4b027a | 397 | DBG("Cleaning up"); |
e07ae692 | 398 | |
2f77fc4b DG |
399 | /* First thing first, stop all threads */ |
400 | utils_close_pipe(thread_quit_pipe); | |
401 | ||
35f90c40 DG |
402 | /* |
403 | * If opt_pidfile is undefined, the default file will be wiped when | |
404 | * removing the rundir. | |
405 | */ | |
406 | if (opt_pidfile) { | |
407 | ret = remove(opt_pidfile); | |
408 | if (ret < 0) { | |
409 | PERROR("remove pidfile %s", opt_pidfile); | |
410 | } | |
411 | } | |
412 | ||
67e40797 DG |
413 | DBG("Removing %s directory", rundir); |
414 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
415 | if (ret < 0) { | |
416 | ERR("asprintf failed. Something is really wrong!"); | |
417 | } | |
5461b305 | 418 | |
67e40797 DG |
419 | /* Remove lttng run directory */ |
420 | ret = system(cmd); | |
421 | if (ret < 0) { | |
422 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 423 | } |
67e40797 | 424 | free(cmd); |
bd69add2 | 425 | free(rundir); |
5461b305 | 426 | |
99bab54f | 427 | DBG("Cleaning up all sessions"); |
fac6795d | 428 | |
b5541356 | 429 | /* Destroy session list mutex */ |
273ea72c DG |
430 | if (session_list_ptr != NULL) { |
431 | pthread_mutex_destroy(&session_list_ptr->lock); | |
432 | ||
433 | /* Cleanup ALL session */ | |
54d01ffb DG |
434 | cds_list_for_each_entry_safe(sess, stmp, |
435 | &session_list_ptr->head, list) { | |
2f77fc4b | 436 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
437 | } |
438 | } | |
439 | ||
099e26bd | 440 | DBG("Closing all UST sockets"); |
56fff090 | 441 | ust_app_clean_list(); |
099e26bd | 442 | |
4fba7219 DG |
443 | if (is_root && !opt_no_kernel) { |
444 | DBG2("Closing kernel fd"); | |
a4b35e07 | 445 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
446 | ret = close(kernel_tracer_fd); |
447 | if (ret) { | |
448 | PERROR("close"); | |
449 | } | |
a4b35e07 | 450 | } |
2f50c8a3 | 451 | DBG("Unloading kernel modules"); |
096102bd | 452 | modprobe_remove_lttng_all(); |
2f50c8a3 | 453 | } |
2f77fc4b | 454 | |
421cb601 | 455 | /* <fun> */ |
f56a39af | 456 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
457 | "Matthew, BEET driven development works!%c[%dm", |
458 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
459 | /* </fun> */ | |
fac6795d DG |
460 | } |
461 | ||
e065084a | 462 | /* |
d063d709 | 463 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 464 | * |
d063d709 | 465 | * Return lttcomm error code. |
e065084a DG |
466 | */ |
467 | static int send_unix_sock(int sock, void *buf, size_t len) | |
468 | { | |
469 | /* Check valid length */ | |
c617c0c6 | 470 | if (len == 0) { |
e065084a DG |
471 | return -1; |
472 | } | |
473 | ||
474 | return lttcomm_send_unix_sock(sock, buf, len); | |
475 | } | |
476 | ||
5461b305 | 477 | /* |
d063d709 | 478 | * Free memory of a command context structure. |
5461b305 | 479 | */ |
a2fb29a5 | 480 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 481 | { |
a2fb29a5 DG |
482 | DBG("Clean command context structure"); |
483 | if (*cmd_ctx) { | |
484 | if ((*cmd_ctx)->llm) { | |
485 | free((*cmd_ctx)->llm); | |
5461b305 | 486 | } |
a2fb29a5 DG |
487 | if ((*cmd_ctx)->lsm) { |
488 | free((*cmd_ctx)->lsm); | |
5461b305 | 489 | } |
a2fb29a5 DG |
490 | free(*cmd_ctx); |
491 | *cmd_ctx = NULL; | |
5461b305 DG |
492 | } |
493 | } | |
494 | ||
fac6795d | 495 | /* |
0fdd1e2c | 496 | * Notify UST applications using the shm mmap futex. |
fac6795d | 497 | */ |
0fdd1e2c | 498 | static int notify_ust_apps(int active) |
fac6795d | 499 | { |
0fdd1e2c | 500 | char *wait_shm_mmap; |
fac6795d | 501 | |
0fdd1e2c | 502 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 503 | |
0fdd1e2c DG |
504 | /* See shm.c for this call implying mmap, shm and futex calls */ |
505 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
506 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
507 | goto error; |
508 | } | |
509 | ||
0fdd1e2c DG |
510 | /* Wake waiting process */ |
511 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
512 | ||
513 | /* Apps notified successfully */ | |
514 | return 0; | |
fac6795d DG |
515 | |
516 | error: | |
0fdd1e2c | 517 | return -1; |
fac6795d DG |
518 | } |
519 | ||
e065084a | 520 | /* |
d063d709 DG |
521 | * Setup the outgoing data buffer for the response (llm) by allocating the |
522 | * right amount of memory and copying the original information from the lsm | |
523 | * structure. | |
ca95a216 | 524 | * |
d063d709 | 525 | * Return total size of the buffer pointed by buf. |
ca95a216 | 526 | */ |
5461b305 | 527 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 528 | { |
f3ed775e | 529 | int ret, buf_size; |
ca95a216 | 530 | |
f3ed775e | 531 | buf_size = size; |
5461b305 | 532 | |
ba7f0ae5 | 533 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 534 | if (cmd_ctx->llm == NULL) { |
76d7553f | 535 | PERROR("zmalloc"); |
5461b305 | 536 | ret = -ENOMEM; |
ca95a216 DG |
537 | goto error; |
538 | } | |
539 | ||
5461b305 DG |
540 | /* Copy common data */ |
541 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 542 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 543 | |
5461b305 DG |
544 | cmd_ctx->llm->data_size = size; |
545 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
546 | ||
ca95a216 DG |
547 | return buf_size; |
548 | ||
549 | error: | |
550 | return ret; | |
551 | } | |
552 | ||
7a485870 | 553 | /* |
5eb91c98 | 554 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 555 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 556 | */ |
5eb91c98 | 557 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 558 | { |
5eb91c98 | 559 | int ret; |
7a485870 DG |
560 | struct ltt_session *session; |
561 | struct ltt_kernel_channel *channel; | |
562 | ||
5eb91c98 | 563 | DBG("Updating kernel poll set"); |
7a485870 | 564 | |
54d01ffb | 565 | session_lock_list(); |
b5541356 | 566 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 567 | session_lock(session); |
7a485870 | 568 | if (session->kernel_session == NULL) { |
54d01ffb | 569 | session_unlock(session); |
7a485870 DG |
570 | continue; |
571 | } | |
7a485870 | 572 | |
54d01ffb DG |
573 | cds_list_for_each_entry(channel, |
574 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
575 | /* Add channel fd to the kernel poll set */ |
576 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
577 | if (ret < 0) { | |
54d01ffb | 578 | session_unlock(session); |
5eb91c98 DG |
579 | goto error; |
580 | } | |
581 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 582 | } |
54d01ffb | 583 | session_unlock(session); |
7a485870 | 584 | } |
54d01ffb | 585 | session_unlock_list(); |
7a485870 | 586 | |
5eb91c98 | 587 | return 0; |
7a485870 DG |
588 | |
589 | error: | |
54d01ffb | 590 | session_unlock_list(); |
7a485870 DG |
591 | return -1; |
592 | } | |
593 | ||
594 | /* | |
54d01ffb | 595 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 596 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 597 | * |
d063d709 | 598 | * Useful for CPU hotplug feature. |
7a485870 | 599 | */ |
2bdd86d4 | 600 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
601 | { |
602 | int ret = 0; | |
603 | struct ltt_session *session; | |
173af62f | 604 | struct ltt_kernel_session *ksess; |
7a485870 DG |
605 | struct ltt_kernel_channel *channel; |
606 | ||
607 | DBG("Updating kernel streams for channel fd %d", fd); | |
608 | ||
54d01ffb | 609 | session_lock_list(); |
b5541356 | 610 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 611 | session_lock(session); |
7a485870 | 612 | if (session->kernel_session == NULL) { |
54d01ffb | 613 | session_unlock(session); |
7a485870 DG |
614 | continue; |
615 | } | |
173af62f | 616 | ksess = session->kernel_session; |
d9800920 | 617 | |
173af62f | 618 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
619 | if (channel->fd == fd) { |
620 | DBG("Channel found, updating kernel streams"); | |
621 | ret = kernel_open_channel_stream(channel); | |
622 | if (ret < 0) { | |
b3c750d2 | 623 | goto error; |
7a485870 | 624 | } |
d9800920 | 625 | |
7a485870 | 626 | /* |
5eb91c98 DG |
627 | * Have we already sent fds to the consumer? If yes, it means |
628 | * that tracing is started so it is safe to send our updated | |
629 | * stream fds. | |
7a485870 | 630 | */ |
173af62f DG |
631 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
632 | struct lttng_ht_iter iter; | |
633 | struct consumer_socket *socket; | |
634 | ||
e7fe706f | 635 | rcu_read_lock(); |
173af62f DG |
636 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
637 | &iter.iter, socket, node.node) { | |
638 | /* Code flow error */ | |
639 | assert(socket->fd >= 0); | |
640 | ||
641 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 642 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
643 | channel, ksess); |
644 | pthread_mutex_unlock(socket->lock); | |
645 | if (ret < 0) { | |
e7fe706f | 646 | rcu_read_unlock(); |
173af62f DG |
647 | goto error; |
648 | } | |
7a485870 | 649 | } |
e7fe706f | 650 | rcu_read_unlock(); |
7a485870 | 651 | } |
b3c750d2 | 652 | goto error; |
7a485870 DG |
653 | } |
654 | } | |
54d01ffb | 655 | session_unlock(session); |
7a485870 | 656 | } |
54d01ffb | 657 | session_unlock_list(); |
b3c750d2 | 658 | return ret; |
7a485870 | 659 | |
b3c750d2 | 660 | error: |
54d01ffb DG |
661 | session_unlock(session); |
662 | session_unlock_list(); | |
7a485870 DG |
663 | return ret; |
664 | } | |
665 | ||
487cf67c | 666 | /* |
ffe60014 DG |
667 | * For each tracing session, update newly registered apps. The session list |
668 | * lock MUST be acquired before calling this. | |
487cf67c DG |
669 | */ |
670 | static void update_ust_app(int app_sock) | |
671 | { | |
672 | struct ltt_session *sess, *stmp; | |
673 | ||
674 | /* For all tracing session(s) */ | |
675 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 676 | session_lock(sess); |
421cb601 DG |
677 | if (sess->ust_session) { |
678 | ust_app_global_update(sess->ust_session, app_sock); | |
679 | } | |
4ee14516 | 680 | session_unlock(sess); |
487cf67c DG |
681 | } |
682 | } | |
683 | ||
7a485870 | 684 | /* |
d063d709 | 685 | * This thread manage event coming from the kernel. |
7a485870 | 686 | * |
d063d709 DG |
687 | * Features supported in this thread: |
688 | * -) CPU Hotplug | |
7a485870 DG |
689 | */ |
690 | static void *thread_manage_kernel(void *data) | |
691 | { | |
139ac872 | 692 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 693 | uint32_t revents, nb_fd; |
7a485870 | 694 | char tmp; |
5eb91c98 | 695 | struct lttng_poll_event events; |
7a485870 | 696 | |
6993eeb3 | 697 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 698 | |
927ca06a DG |
699 | health_register(HEALTH_TYPE_KERNEL); |
700 | ||
d5d63bf1 DG |
701 | /* |
702 | * This first step of the while is to clean this structure which could free | |
703 | * non NULL pointers so zero it before the loop. | |
704 | */ | |
705 | memset(&events, 0, sizeof(events)); | |
706 | ||
6993eeb3 CB |
707 | if (testpoint(thread_manage_kernel)) { |
708 | goto error_testpoint; | |
709 | } | |
8ac94142 | 710 | |
840cb59c | 711 | health_code_update(); |
44a5e5eb | 712 | |
6993eeb3 | 713 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 714 | goto error_testpoint; |
6993eeb3 CB |
715 | } |
716 | ||
7a485870 | 717 | while (1) { |
840cb59c | 718 | health_code_update(); |
44a5e5eb | 719 | |
7a485870 | 720 | if (update_poll_flag == 1) { |
d21b0d71 DG |
721 | /* Clean events object. We are about to populate it again. */ |
722 | lttng_poll_clean(&events); | |
723 | ||
724 | ret = create_thread_poll_set(&events, 2); | |
725 | if (ret < 0) { | |
726 | goto error_poll_create; | |
727 | } | |
728 | ||
729 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
730 | if (ret < 0) { | |
731 | goto error; | |
732 | } | |
5f822d0a | 733 | |
d21b0d71 | 734 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
735 | ret = update_kernel_poll(&events); |
736 | if (ret < 0) { | |
7a485870 DG |
737 | goto error; |
738 | } | |
739 | update_poll_flag = 0; | |
740 | } | |
741 | ||
d21b0d71 | 742 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
743 | |
744 | /* Poll infinite value of time */ | |
88f2b785 | 745 | restart: |
a78af745 | 746 | health_poll_entry(); |
5eb91c98 | 747 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 748 | health_poll_exit(); |
7a485870 | 749 | if (ret < 0) { |
88f2b785 MD |
750 | /* |
751 | * Restart interrupted system call. | |
752 | */ | |
753 | if (errno == EINTR) { | |
754 | goto restart; | |
755 | } | |
7a485870 DG |
756 | goto error; |
757 | } else if (ret == 0) { | |
758 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
759 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
760 | "This should not have happened! Continuing..."); | |
7a485870 DG |
761 | continue; |
762 | } | |
763 | ||
0d9c5d77 DG |
764 | nb_fd = ret; |
765 | ||
5eb91c98 DG |
766 | for (i = 0; i < nb_fd; i++) { |
767 | /* Fetch once the poll data */ | |
768 | revents = LTTNG_POLL_GETEV(&events, i); | |
769 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 770 | |
840cb59c | 771 | health_code_update(); |
44a5e5eb | 772 | |
5eb91c98 DG |
773 | /* Thread quit pipe has been closed. Killing thread. */ |
774 | ret = check_thread_quit_pipe(pollfd, revents); | |
775 | if (ret) { | |
139ac872 MD |
776 | err = 0; |
777 | goto exit; | |
5eb91c98 | 778 | } |
7a485870 | 779 | |
5eb91c98 DG |
780 | /* Check for data on kernel pipe */ |
781 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
782 | do { |
783 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
784 | } while (ret < 0 && errno == EINTR); | |
785 | /* | |
786 | * Ret value is useless here, if this pipe gets any actions an | |
787 | * update is required anyway. | |
788 | */ | |
5eb91c98 DG |
789 | update_poll_flag = 1; |
790 | continue; | |
791 | } else { | |
792 | /* | |
793 | * New CPU detected by the kernel. Adding kernel stream to | |
794 | * kernel session and updating the kernel consumer | |
795 | */ | |
796 | if (revents & LPOLLIN) { | |
2bdd86d4 | 797 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
798 | if (ret < 0) { |
799 | continue; | |
800 | } | |
801 | break; | |
802 | /* | |
803 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
804 | * and unregister kernel stream at this point. | |
805 | */ | |
7a485870 | 806 | } |
7a485870 DG |
807 | } |
808 | } | |
809 | } | |
810 | ||
139ac872 | 811 | exit: |
7a485870 | 812 | error: |
5eb91c98 | 813 | lttng_poll_clean(&events); |
76d7553f | 814 | error_poll_create: |
6993eeb3 | 815 | error_testpoint: |
6620da75 DG |
816 | utils_close_pipe(kernel_poll_pipe); |
817 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 818 | if (err) { |
840cb59c | 819 | health_error(); |
139ac872 | 820 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
821 | WARN("Kernel thread died unexpectedly. " |
822 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 823 | } |
927ca06a | 824 | health_unregister(); |
76d7553f | 825 | DBG("Kernel thread dying"); |
7a485870 DG |
826 | return NULL; |
827 | } | |
828 | ||
a23ec3a7 DG |
829 | /* |
830 | * Signal pthread condition of the consumer data that the thread. | |
831 | */ | |
832 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
833 | { | |
834 | pthread_mutex_lock(&data->cond_mutex); | |
835 | ||
836 | /* | |
837 | * The state is set before signaling. It can be any value, it's the waiter | |
838 | * job to correctly interpret this condition variable associated to the | |
839 | * consumer pthread_cond. | |
840 | * | |
841 | * A value of 0 means that the corresponding thread of the consumer data | |
842 | * was not started. 1 indicates that the thread has started and is ready | |
843 | * for action. A negative value means that there was an error during the | |
844 | * thread bootstrap. | |
845 | */ | |
846 | data->consumer_thread_is_ready = state; | |
847 | (void) pthread_cond_signal(&data->cond); | |
848 | ||
849 | pthread_mutex_unlock(&data->cond_mutex); | |
850 | } | |
851 | ||
1d4b027a | 852 | /* |
3bd1e081 | 853 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 854 | */ |
3bd1e081 | 855 | static void *thread_manage_consumer(void *data) |
1d4b027a | 856 | { |
139ac872 | 857 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 858 | uint32_t revents, nb_fd; |
1d4b027a | 859 | enum lttcomm_return_code code; |
5eb91c98 | 860 | struct lttng_poll_event events; |
3bd1e081 | 861 | struct consumer_data *consumer_data = data; |
1d4b027a | 862 | |
3bd1e081 | 863 | DBG("[thread] Manage consumer started"); |
1d4b027a | 864 | |
927ca06a DG |
865 | health_register(HEALTH_TYPE_CONSUMER); |
866 | ||
855060f8 | 867 | health_code_update(); |
9449cc75 | 868 | |
5eb91c98 DG |
869 | /* |
870 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
871 | * Nothing more will be added to this poll set. | |
872 | */ | |
873 | ret = create_thread_poll_set(&events, 2); | |
874 | if (ret < 0) { | |
76d7553f | 875 | goto error_poll; |
5eb91c98 | 876 | } |
273ea72c | 877 | |
edb8b045 DG |
878 | /* |
879 | * The error socket here is already in a listening state which was done | |
880 | * just before spawning this thread to avoid a race between the consumer | |
881 | * daemon exec trying to connect and the listen() call. | |
882 | */ | |
3bd1e081 | 883 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
884 | if (ret < 0) { |
885 | goto error; | |
886 | } | |
887 | ||
840cb59c | 888 | health_code_update(); |
44a5e5eb | 889 | |
273ea72c | 890 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 891 | restart: |
a78af745 | 892 | health_poll_entry(); |
8ac94142 | 893 | |
6993eeb3 CB |
894 | if (testpoint(thread_manage_consumer)) { |
895 | goto error; | |
896 | } | |
8ac94142 | 897 | |
5eb91c98 | 898 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 899 | health_poll_exit(); |
273ea72c | 900 | if (ret < 0) { |
88f2b785 MD |
901 | /* |
902 | * Restart interrupted system call. | |
903 | */ | |
904 | if (errno == EINTR) { | |
905 | goto restart; | |
906 | } | |
273ea72c DG |
907 | goto error; |
908 | } | |
909 | ||
0d9c5d77 DG |
910 | nb_fd = ret; |
911 | ||
5eb91c98 DG |
912 | for (i = 0; i < nb_fd; i++) { |
913 | /* Fetch once the poll data */ | |
914 | revents = LTTNG_POLL_GETEV(&events, i); | |
915 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
916 | ||
840cb59c | 917 | health_code_update(); |
44a5e5eb | 918 | |
5eb91c98 DG |
919 | /* Thread quit pipe has been closed. Killing thread. */ |
920 | ret = check_thread_quit_pipe(pollfd, revents); | |
921 | if (ret) { | |
139ac872 MD |
922 | err = 0; |
923 | goto exit; | |
5eb91c98 DG |
924 | } |
925 | ||
926 | /* Event on the registration socket */ | |
3bd1e081 | 927 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 928 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 929 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
930 | goto error; |
931 | } | |
932 | } | |
273ea72c DG |
933 | } |
934 | ||
3bd1e081 | 935 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
936 | if (sock < 0) { |
937 | goto error; | |
938 | } | |
939 | ||
b662582b DG |
940 | /* |
941 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
942 | * show must go on. | |
943 | */ | |
944 | (void) utils_set_fd_cloexec(sock); | |
945 | ||
840cb59c | 946 | health_code_update(); |
44a5e5eb | 947 | |
3bd1e081 | 948 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 949 | |
712ea556 | 950 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
951 | ret = lttcomm_recv_unix_sock(sock, &code, |
952 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
953 | if (ret <= 0) { |
954 | goto error; | |
955 | } | |
956 | ||
840cb59c | 957 | health_code_update(); |
44a5e5eb | 958 | |
f73fabfd | 959 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
960 | consumer_data->cmd_sock = |
961 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
962 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
963 | /* On error, signal condition and quit. */ |
964 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 965 | PERROR("consumer connect"); |
1d4b027a DG |
966 | goto error; |
967 | } | |
a23ec3a7 DG |
968 | signal_consumer_condition(consumer_data, 1); |
969 | DBG("Consumer command socket ready"); | |
1d4b027a | 970 | } else { |
3bd1e081 | 971 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
972 | lttcomm_get_readable_code(-code)); |
973 | goto error; | |
974 | } | |
975 | ||
54d01ffb | 976 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 977 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 978 | if (ret < 0) { |
72079cae DG |
979 | goto error; |
980 | } | |
981 | ||
5eb91c98 DG |
982 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
983 | if (ret < 0) { | |
72079cae | 984 | goto error; |
5eb91c98 DG |
985 | } |
986 | ||
840cb59c | 987 | health_code_update(); |
44a5e5eb | 988 | |
5eb91c98 | 989 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 990 | restart_poll: |
a78af745 | 991 | health_poll_entry(); |
5eb91c98 | 992 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 993 | health_poll_exit(); |
5eb91c98 | 994 | if (ret < 0) { |
88f2b785 MD |
995 | /* |
996 | * Restart interrupted system call. | |
997 | */ | |
998 | if (errno == EINTR) { | |
999 | goto restart_poll; | |
1000 | } | |
72079cae DG |
1001 | goto error; |
1002 | } | |
1003 | ||
0d9c5d77 DG |
1004 | nb_fd = ret; |
1005 | ||
5eb91c98 DG |
1006 | for (i = 0; i < nb_fd; i++) { |
1007 | /* Fetch once the poll data */ | |
1008 | revents = LTTNG_POLL_GETEV(&events, i); | |
1009 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1010 | ||
840cb59c | 1011 | health_code_update(); |
44a5e5eb | 1012 | |
5eb91c98 DG |
1013 | /* Thread quit pipe has been closed. Killing thread. */ |
1014 | ret = check_thread_quit_pipe(pollfd, revents); | |
1015 | if (ret) { | |
139ac872 MD |
1016 | err = 0; |
1017 | goto exit; | |
5eb91c98 DG |
1018 | } |
1019 | ||
1020 | /* Event on the kconsumerd socket */ | |
1021 | if (pollfd == sock) { | |
1022 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1023 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1024 | goto error; |
1025 | } | |
1026 | } | |
1027 | } | |
1028 | ||
840cb59c | 1029 | health_code_update(); |
44a5e5eb | 1030 | |
712ea556 | 1031 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1032 | ret = lttcomm_recv_unix_sock(sock, &code, |
1033 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1034 | if (ret <= 0) { |
3bd1e081 | 1035 | ERR("consumer closed the command socket"); |
712ea556 | 1036 | goto error; |
6f61d021 | 1037 | } |
1d4b027a | 1038 | |
3bd1e081 | 1039 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1040 | |
139ac872 | 1041 | exit: |
1d4b027a | 1042 | error: |
5c827ce0 DG |
1043 | /* Immediately set the consumerd state to stopped */ |
1044 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1045 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1046 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1047 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1048 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1049 | } else { | |
1050 | /* Code flow error... */ | |
1051 | assert(0); | |
1052 | } | |
1053 | ||
76d7553f MD |
1054 | if (consumer_data->err_sock >= 0) { |
1055 | ret = close(consumer_data->err_sock); | |
1056 | if (ret) { | |
1057 | PERROR("close"); | |
1058 | } | |
1059 | } | |
1060 | if (consumer_data->cmd_sock >= 0) { | |
1061 | ret = close(consumer_data->cmd_sock); | |
1062 | if (ret) { | |
1063 | PERROR("close"); | |
1064 | } | |
1065 | } | |
1066 | if (sock >= 0) { | |
1067 | ret = close(sock); | |
1068 | if (ret) { | |
1069 | PERROR("close"); | |
1070 | } | |
1071 | } | |
273ea72c | 1072 | |
3bd1e081 MD |
1073 | unlink(consumer_data->err_unix_sock_path); |
1074 | unlink(consumer_data->cmd_unix_sock_path); | |
1075 | consumer_data->pid = 0; | |
1d4b027a | 1076 | |
5eb91c98 | 1077 | lttng_poll_clean(&events); |
76d7553f | 1078 | error_poll: |
139ac872 | 1079 | if (err) { |
840cb59c | 1080 | health_error(); |
139ac872 MD |
1081 | ERR("Health error occurred in %s", __func__); |
1082 | } | |
927ca06a | 1083 | health_unregister(); |
76d7553f | 1084 | DBG("consumer thread cleanup completed"); |
0177d773 | 1085 | |
5eb91c98 | 1086 | return NULL; |
099e26bd DG |
1087 | } |
1088 | ||
099e26bd DG |
1089 | /* |
1090 | * This thread manage application communication. | |
1d4b027a DG |
1091 | */ |
1092 | static void *thread_manage_apps(void *data) | |
099e26bd | 1093 | { |
139ac872 | 1094 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1095 | uint32_t revents, nb_fd; |
099e26bd | 1096 | struct ust_command ust_cmd; |
5eb91c98 | 1097 | struct lttng_poll_event events; |
099e26bd DG |
1098 | |
1099 | DBG("[thread] Manage application started"); | |
1100 | ||
f6a9efaa DG |
1101 | rcu_register_thread(); |
1102 | rcu_thread_online(); | |
1103 | ||
927ca06a DG |
1104 | health_register(HEALTH_TYPE_APP_MANAGE); |
1105 | ||
6993eeb3 CB |
1106 | if (testpoint(thread_manage_apps)) { |
1107 | goto error_testpoint; | |
1108 | } | |
1109 | ||
840cb59c | 1110 | health_code_update(); |
44a5e5eb | 1111 | |
5eb91c98 DG |
1112 | ret = create_thread_poll_set(&events, 2); |
1113 | if (ret < 0) { | |
76d7553f | 1114 | goto error_poll_create; |
5eb91c98 | 1115 | } |
099e26bd | 1116 | |
5eb91c98 DG |
1117 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1118 | if (ret < 0) { | |
1119 | goto error; | |
1120 | } | |
099e26bd | 1121 | |
6993eeb3 CB |
1122 | if (testpoint(thread_manage_apps_before_loop)) { |
1123 | goto error; | |
1124 | } | |
8ac94142 | 1125 | |
840cb59c | 1126 | health_code_update(); |
44a5e5eb | 1127 | |
5eb91c98 | 1128 | while (1) { |
d21b0d71 | 1129 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1130 | |
1131 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1132 | restart: |
a78af745 | 1133 | health_poll_entry(); |
5eb91c98 | 1134 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1135 | health_poll_exit(); |
099e26bd | 1136 | if (ret < 0) { |
88f2b785 MD |
1137 | /* |
1138 | * Restart interrupted system call. | |
1139 | */ | |
1140 | if (errno == EINTR) { | |
1141 | goto restart; | |
1142 | } | |
099e26bd DG |
1143 | goto error; |
1144 | } | |
1145 | ||
0d9c5d77 DG |
1146 | nb_fd = ret; |
1147 | ||
5eb91c98 DG |
1148 | for (i = 0; i < nb_fd; i++) { |
1149 | /* Fetch once the poll data */ | |
1150 | revents = LTTNG_POLL_GETEV(&events, i); | |
1151 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1152 | ||
840cb59c | 1153 | health_code_update(); |
44a5e5eb | 1154 | |
5eb91c98 DG |
1155 | /* Thread quit pipe has been closed. Killing thread. */ |
1156 | ret = check_thread_quit_pipe(pollfd, revents); | |
1157 | if (ret) { | |
139ac872 MD |
1158 | err = 0; |
1159 | goto exit; | |
5eb91c98 | 1160 | } |
099e26bd | 1161 | |
5eb91c98 DG |
1162 | /* Inspect the apps cmd pipe */ |
1163 | if (pollfd == apps_cmd_pipe[0]) { | |
1164 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1165 | ERR("Apps command pipe error"); | |
0177d773 | 1166 | goto error; |
5eb91c98 DG |
1167 | } else if (revents & LPOLLIN) { |
1168 | /* Empty pipe */ | |
f921c78f DG |
1169 | do { |
1170 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1171 | } while (ret < 0 && errno == EINTR); | |
5eb91c98 | 1172 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
76d7553f | 1173 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1174 | goto error; |
1175 | } | |
099e26bd | 1176 | |
840cb59c | 1177 | health_code_update(); |
44a5e5eb | 1178 | |
ffe60014 DG |
1179 | /* |
1180 | * @session_lock | |
1181 | * Lock the global session list so from the register up to | |
1182 | * the registration done message, no thread can see the | |
1183 | * application and change its state. | |
1184 | */ | |
1185 | session_lock_list(); | |
1186 | ||
5eb91c98 | 1187 | /* Register applicaton to the session daemon */ |
56fff090 | 1188 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1189 | ust_cmd.sock); |
88ff5b7f | 1190 | if (ret == -ENOMEM) { |
ffe60014 | 1191 | session_unlock_list(); |
5eb91c98 | 1192 | goto error; |
88ff5b7f | 1193 | } else if (ret < 0) { |
ffe60014 | 1194 | session_unlock_list(); |
88ff5b7f | 1195 | break; |
5eb91c98 DG |
1196 | } |
1197 | ||
840cb59c | 1198 | health_code_update(); |
44a5e5eb | 1199 | |
acc7b41b | 1200 | /* |
e0c7ec2b | 1201 | * Validate UST version compatibility. |
acc7b41b | 1202 | */ |
e0c7ec2b DG |
1203 | ret = ust_app_validate_version(ust_cmd.sock); |
1204 | if (ret >= 0) { | |
1205 | /* | |
1206 | * Add channel(s) and event(s) to newly registered apps | |
1207 | * from lttng global UST domain. | |
1208 | */ | |
1209 | update_ust_app(ust_cmd.sock); | |
1210 | } | |
acc7b41b | 1211 | |
840cb59c | 1212 | health_code_update(); |
44a5e5eb | 1213 | |
f2ca2e25 | 1214 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1215 | if (ret < 0) { |
1216 | /* | |
1217 | * If the registration is not possible, we simply | |
1218 | * unregister the apps and continue | |
1219 | */ | |
56fff090 | 1220 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1221 | } else { |
1222 | /* | |
622c9ecf DG |
1223 | * We only monitor the error events of the socket. This |
1224 | * thread does not handle any incoming data from UST | |
1225 | * (POLLIN). | |
5eb91c98 | 1226 | */ |
622c9ecf DG |
1227 | ret = lttng_poll_add(&events, ust_cmd.sock, |
1228 | LPOLLERR & LPOLLHUP & LPOLLRDHUP); | |
5eb91c98 | 1229 | if (ret < 0) { |
ffe60014 | 1230 | session_unlock_list(); |
5eb91c98 DG |
1231 | goto error; |
1232 | } | |
1233 | ||
ae9e45b3 DG |
1234 | /* Set socket timeout for both receiving and ending */ |
1235 | (void) lttcomm_setsockopt_rcv_timeout(ust_cmd.sock, | |
1236 | app_socket_timeout); | |
1237 | (void) lttcomm_setsockopt_snd_timeout(ust_cmd.sock, | |
1238 | app_socket_timeout); | |
1239 | ||
54d01ffb DG |
1240 | DBG("Apps with sock %d added to poll set", |
1241 | ust_cmd.sock); | |
5eb91c98 | 1242 | } |
ffe60014 | 1243 | session_unlock_list(); |
487cf67c | 1244 | |
840cb59c | 1245 | health_code_update(); |
44a5e5eb | 1246 | |
5eb91c98 | 1247 | break; |
0177d773 | 1248 | } |
5eb91c98 DG |
1249 | } else { |
1250 | /* | |
54d01ffb DG |
1251 | * At this point, we know that a registered application made |
1252 | * the event at poll_wait. | |
5eb91c98 DG |
1253 | */ |
1254 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1255 | /* Removing from the poll set */ | |
1256 | ret = lttng_poll_del(&events, pollfd); | |
1257 | if (ret < 0) { | |
1258 | goto error; | |
1259 | } | |
099e26bd | 1260 | |
b9d9b220 | 1261 | /* Socket closed on remote end. */ |
56fff090 | 1262 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1263 | break; |
1264 | } | |
099e26bd | 1265 | } |
44a5e5eb | 1266 | |
840cb59c | 1267 | health_code_update(); |
099e26bd | 1268 | } |
099e26bd DG |
1269 | } |
1270 | ||
139ac872 | 1271 | exit: |
099e26bd | 1272 | error: |
5eb91c98 | 1273 | lttng_poll_clean(&events); |
76d7553f | 1274 | error_poll_create: |
6993eeb3 | 1275 | error_testpoint: |
6620da75 DG |
1276 | utils_close_pipe(apps_cmd_pipe); |
1277 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1278 | ||
1279 | /* | |
1280 | * We don't clean the UST app hash table here since already registered | |
1281 | * applications can still be controlled so let them be until the session | |
1282 | * daemon dies or the applications stop. | |
1283 | */ | |
1284 | ||
139ac872 | 1285 | if (err) { |
840cb59c | 1286 | health_error(); |
139ac872 MD |
1287 | ERR("Health error occurred in %s", __func__); |
1288 | } | |
927ca06a | 1289 | health_unregister(); |
76d7553f | 1290 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1291 | rcu_thread_offline(); |
1292 | rcu_unregister_thread(); | |
099e26bd DG |
1293 | return NULL; |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * Dispatch request from the registration threads to the application | |
1298 | * communication thread. | |
1299 | */ | |
1300 | static void *thread_dispatch_ust_registration(void *data) | |
1301 | { | |
1302 | int ret; | |
1303 | struct cds_wfq_node *node; | |
1304 | struct ust_command *ust_cmd = NULL; | |
1305 | ||
1306 | DBG("[thread] Dispatch UST command started"); | |
1307 | ||
26c9d55e | 1308 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1309 | /* Atomically prepare the queue futex */ |
1310 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1311 | ||
1312 | do { | |
1313 | /* Dequeue command for registration */ | |
1314 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1315 | if (node == NULL) { | |
00a17c97 | 1316 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1317 | /* Continue thread execution */ |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1322 | ||
2f50c8a3 DG |
1323 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1324 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1325 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1326 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1327 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1328 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1329 | /* |
1330 | * Inform apps thread of the new application registration. This | |
1331 | * call is blocking so we can be assured that the data will be read | |
1332 | * at some point in time or wait to the end of the world :) | |
1333 | */ | |
6620da75 | 1334 | if (apps_cmd_pipe[1] >= 0) { |
fbb3b395 DG |
1335 | do { |
1336 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1337 | sizeof(struct ust_command)); | |
1338 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1339 | if (ret < 0 || ret != sizeof(struct ust_command)) { |
6620da75 DG |
1340 | PERROR("write apps cmd pipe"); |
1341 | if (errno == EBADF) { | |
1342 | /* | |
1343 | * We can't inform the application thread to process | |
1344 | * registration. We will exit or else application | |
1345 | * registration will not occur and tracing will never | |
1346 | * start. | |
1347 | */ | |
1348 | goto error; | |
1349 | } | |
1350 | } | |
1351 | } else { | |
1352 | /* Application manager thread is not available. */ | |
1353 | ret = close(ust_cmd->sock); | |
1354 | if (ret < 0) { | |
1355 | PERROR("close ust_cmd sock"); | |
099e26bd DG |
1356 | } |
1357 | } | |
1358 | free(ust_cmd); | |
1359 | } while (node != NULL); | |
1360 | ||
1361 | /* Futex wait on queue. Blocking call on futex() */ | |
1362 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1363 | } | |
1364 | ||
1365 | error: | |
1366 | DBG("Dispatch thread dying"); | |
1367 | return NULL; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * This thread manage application registration. | |
1372 | */ | |
1373 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1374 | { |
139ac872 | 1375 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1376 | uint32_t revents, nb_fd; |
1377 | struct lttng_poll_event events; | |
099e26bd DG |
1378 | /* |
1379 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1380 | * freed in the manage apps thread. | |
1381 | */ | |
1382 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1383 | |
099e26bd | 1384 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1385 | |
927ca06a DG |
1386 | health_register(HEALTH_TYPE_APP_REG); |
1387 | ||
6993eeb3 CB |
1388 | if (testpoint(thread_registration_apps)) { |
1389 | goto error_testpoint; | |
1390 | } | |
8ac94142 | 1391 | |
1d4b027a DG |
1392 | ret = lttcomm_listen_unix_sock(apps_sock); |
1393 | if (ret < 0) { | |
76d7553f | 1394 | goto error_listen; |
1d4b027a DG |
1395 | } |
1396 | ||
5eb91c98 DG |
1397 | /* |
1398 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1399 | * more will be added to this poll set. | |
1400 | */ | |
1401 | ret = create_thread_poll_set(&events, 2); | |
1402 | if (ret < 0) { | |
76d7553f | 1403 | goto error_create_poll; |
5eb91c98 | 1404 | } |
273ea72c | 1405 | |
5eb91c98 DG |
1406 | /* Add the application registration socket */ |
1407 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1408 | if (ret < 0) { | |
76d7553f | 1409 | goto error_poll_add; |
5eb91c98 | 1410 | } |
273ea72c | 1411 | |
1d4b027a | 1412 | /* Notify all applications to register */ |
0fdd1e2c DG |
1413 | ret = notify_ust_apps(1); |
1414 | if (ret < 0) { | |
1415 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1416 | "Execution continues but there might be problem for already\n" |
1417 | "running applications that wishes to register."); | |
0fdd1e2c | 1418 | } |
1d4b027a DG |
1419 | |
1420 | while (1) { | |
1421 | DBG("Accepting application registration"); | |
273ea72c DG |
1422 | |
1423 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1424 | restart: |
a78af745 | 1425 | health_poll_entry(); |
5eb91c98 | 1426 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1427 | health_poll_exit(); |
273ea72c | 1428 | if (ret < 0) { |
88f2b785 MD |
1429 | /* |
1430 | * Restart interrupted system call. | |
1431 | */ | |
1432 | if (errno == EINTR) { | |
1433 | goto restart; | |
1434 | } | |
273ea72c DG |
1435 | goto error; |
1436 | } | |
1437 | ||
0d9c5d77 DG |
1438 | nb_fd = ret; |
1439 | ||
5eb91c98 | 1440 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1441 | health_code_update(); |
139ac872 | 1442 | |
5eb91c98 DG |
1443 | /* Fetch once the poll data */ |
1444 | revents = LTTNG_POLL_GETEV(&events, i); | |
1445 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1446 | |
5eb91c98 DG |
1447 | /* Thread quit pipe has been closed. Killing thread. */ |
1448 | ret = check_thread_quit_pipe(pollfd, revents); | |
1449 | if (ret) { | |
139ac872 MD |
1450 | err = 0; |
1451 | goto exit; | |
90014c57 | 1452 | } |
1d4b027a | 1453 | |
5eb91c98 DG |
1454 | /* Event on the registration socket */ |
1455 | if (pollfd == apps_sock) { | |
1456 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1457 | ERR("Register apps socket poll error"); | |
1458 | goto error; | |
1459 | } else if (revents & LPOLLIN) { | |
1460 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1461 | if (sock < 0) { | |
1462 | goto error; | |
1463 | } | |
099e26bd | 1464 | |
b662582b DG |
1465 | /* |
1466 | * Set the CLOEXEC flag. Return code is useless because | |
1467 | * either way, the show must go on. | |
1468 | */ | |
1469 | (void) utils_set_fd_cloexec(sock); | |
1470 | ||
5eb91c98 | 1471 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1472 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1473 | if (ust_cmd == NULL) { |
76d7553f | 1474 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1475 | goto error; |
1476 | } | |
1d4b027a | 1477 | |
5eb91c98 DG |
1478 | /* |
1479 | * Using message-based transmissions to ensure we don't | |
1480 | * have to deal with partially received messages. | |
1481 | */ | |
4063050c MD |
1482 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1483 | if (ret < 0) { | |
1484 | ERR("Exhausted file descriptors allowed for applications."); | |
1485 | free(ust_cmd); | |
1486 | ret = close(sock); | |
1487 | if (ret) { | |
1488 | PERROR("close"); | |
1489 | } | |
1490 | sock = -1; | |
1491 | continue; | |
1492 | } | |
840cb59c | 1493 | health_code_update(); |
5eb91c98 DG |
1494 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1495 | sizeof(struct ust_register_msg)); | |
1496 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1497 | if (ret < 0) { | |
76d7553f | 1498 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1499 | } else { |
1500 | ERR("Wrong size received on apps register"); | |
1501 | } | |
1502 | free(ust_cmd); | |
76d7553f MD |
1503 | ret = close(sock); |
1504 | if (ret) { | |
1505 | PERROR("close"); | |
1506 | } | |
4063050c | 1507 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1508 | sock = -1; |
5eb91c98 DG |
1509 | continue; |
1510 | } | |
840cb59c | 1511 | health_code_update(); |
099e26bd | 1512 | |
5eb91c98 | 1513 | ust_cmd->sock = sock; |
34a2494f | 1514 | sock = -1; |
099e26bd | 1515 | |
5eb91c98 DG |
1516 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1517 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1518 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1519 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1520 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1521 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1522 | |
5eb91c98 DG |
1523 | /* |
1524 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1525 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1526 | */ |
1527 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1528 | ||
1529 | /* | |
1530 | * Wake the registration queue futex. Implicit memory | |
1531 | * barrier with the exchange in cds_wfq_enqueue. | |
1532 | */ | |
1533 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1534 | } | |
1535 | } | |
90014c57 | 1536 | } |
1d4b027a DG |
1537 | } |
1538 | ||
139ac872 | 1539 | exit: |
1d4b027a | 1540 | error: |
139ac872 | 1541 | if (err) { |
840cb59c | 1542 | health_error(); |
139ac872 MD |
1543 | ERR("Health error occurred in %s", __func__); |
1544 | } | |
139ac872 | 1545 | |
0fdd1e2c DG |
1546 | /* Notify that the registration thread is gone */ |
1547 | notify_ust_apps(0); | |
1548 | ||
a4b35e07 | 1549 | if (apps_sock >= 0) { |
76d7553f MD |
1550 | ret = close(apps_sock); |
1551 | if (ret) { | |
1552 | PERROR("close"); | |
1553 | } | |
a4b35e07 | 1554 | } |
46c3f085 | 1555 | if (sock >= 0) { |
76d7553f MD |
1556 | ret = close(sock); |
1557 | if (ret) { | |
1558 | PERROR("close"); | |
1559 | } | |
4063050c | 1560 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1561 | } |
273ea72c | 1562 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1563 | |
76d7553f | 1564 | error_poll_add: |
5eb91c98 | 1565 | lttng_poll_clean(&events); |
76d7553f MD |
1566 | error_listen: |
1567 | error_create_poll: | |
6993eeb3 | 1568 | error_testpoint: |
76d7553f | 1569 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1570 | health_unregister(); |
5eb91c98 | 1571 | |
1d4b027a DG |
1572 | return NULL; |
1573 | } | |
1574 | ||
8c0faa1d | 1575 | /* |
3bd1e081 | 1576 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1577 | * exec or it will fails. |
8c0faa1d | 1578 | */ |
3bd1e081 | 1579 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1580 | { |
a23ec3a7 | 1581 | int ret, clock_ret; |
ee0b0061 DG |
1582 | struct timespec timeout; |
1583 | ||
a23ec3a7 DG |
1584 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1585 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1586 | |
a23ec3a7 DG |
1587 | /* Setup pthread condition */ |
1588 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1589 | if (ret != 0) { | |
1590 | errno = ret; | |
1591 | PERROR("pthread_condattr_init consumer data"); | |
1592 | goto error; | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1597 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1598 | * for a more details and how we noticed it. | |
1599 | */ | |
1600 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1601 | if (ret != 0) { | |
1602 | errno = ret; | |
1603 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1604 | goto error; |
1605 | } | |
8c0faa1d | 1606 | |
a23ec3a7 DG |
1607 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1608 | if (ret != 0) { | |
1609 | errno = ret; | |
1610 | PERROR("pthread_cond_init consumer data"); | |
1611 | goto error; | |
1612 | } | |
1613 | ||
1614 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1615 | consumer_data); | |
8c0faa1d | 1616 | if (ret != 0) { |
3bd1e081 | 1617 | PERROR("pthread_create consumer"); |
ee0b0061 | 1618 | ret = -1; |
8c0faa1d DG |
1619 | goto error; |
1620 | } | |
1621 | ||
a23ec3a7 DG |
1622 | /* We are about to wait on a pthread condition */ |
1623 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1624 | ||
ee0b0061 | 1625 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1626 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1627 | /* | |
1628 | * Set the timeout for the condition timed wait even if the clock gettime | |
1629 | * call fails since we might loop on that call and we want to avoid to | |
1630 | * increment the timeout too many times. | |
1631 | */ | |
1632 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1633 | ||
1634 | /* | |
1635 | * The following loop COULD be skipped in some conditions so this is why we | |
1636 | * set ret to 0 in order to make sure at least one round of the loop is | |
1637 | * done. | |
1638 | */ | |
1639 | ret = 0; | |
1640 | ||
1641 | /* | |
1642 | * Loop until the condition is reached or when a timeout is reached. Note | |
1643 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1644 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1645 | * possible. This loop does not take any chances and works with both of | |
1646 | * them. | |
1647 | */ | |
1648 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1649 | if (clock_ret < 0) { | |
1650 | PERROR("clock_gettime spawn consumer"); | |
1651 | /* Infinite wait for the consumerd thread to be ready */ | |
1652 | ret = pthread_cond_wait(&consumer_data->cond, | |
1653 | &consumer_data->cond_mutex); | |
1654 | } else { | |
1655 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1656 | &consumer_data->cond_mutex, &timeout); | |
1657 | } | |
ee0b0061 | 1658 | } |
8c0faa1d | 1659 | |
a23ec3a7 DG |
1660 | /* Release the pthread condition */ |
1661 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1662 | ||
1663 | if (ret != 0) { | |
1664 | errno = ret; | |
1665 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1666 | /* |
1667 | * Call has timed out so we kill the kconsumerd_thread and return | |
1668 | * an error. | |
1669 | */ | |
a23ec3a7 DG |
1670 | ERR("Condition timed out. The consumer thread was never ready." |
1671 | " Killing it"); | |
3bd1e081 | 1672 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1673 | if (ret < 0) { |
3bd1e081 | 1674 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1675 | } |
1676 | } else { | |
a23ec3a7 | 1677 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1678 | } |
1679 | goto error; | |
1680 | } | |
1681 | ||
3bd1e081 MD |
1682 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1683 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1684 | ERR("Consumerd did not start"); |
3bd1e081 | 1685 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1686 | goto error; |
1687 | } | |
3bd1e081 | 1688 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1689 | |
8c0faa1d DG |
1690 | return 0; |
1691 | ||
1692 | error: | |
1693 | return ret; | |
1694 | } | |
1695 | ||
d9800920 | 1696 | /* |
3bd1e081 | 1697 | * Join consumer thread |
d9800920 | 1698 | */ |
3bd1e081 | 1699 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1700 | { |
1701 | void *status; | |
cf3af59e | 1702 | |
e8209f6b DG |
1703 | /* Consumer pid must be a real one. */ |
1704 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1705 | int ret; |
3bd1e081 | 1706 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1707 | if (ret) { |
3bd1e081 | 1708 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1709 | return ret; |
1710 | } | |
3bd1e081 | 1711 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1712 | } else { |
1713 | return 0; | |
1714 | } | |
1715 | } | |
1716 | ||
8c0faa1d | 1717 | /* |
3bd1e081 | 1718 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1719 | * |
d063d709 | 1720 | * Return pid if successful else -1. |
8c0faa1d | 1721 | */ |
3bd1e081 | 1722 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1723 | { |
1724 | int ret; | |
1725 | pid_t pid; | |
94c55f17 | 1726 | const char *consumer_to_use; |
53086306 | 1727 | const char *verbosity; |
94c55f17 | 1728 | struct stat st; |
8c0faa1d | 1729 | |
3bd1e081 | 1730 | DBG("Spawning consumerd"); |
c49dc785 | 1731 | |
8c0faa1d DG |
1732 | pid = fork(); |
1733 | if (pid == 0) { | |
1734 | /* | |
3bd1e081 | 1735 | * Exec consumerd. |
8c0faa1d | 1736 | */ |
daee5345 | 1737 | if (opt_verbose_consumer) { |
53086306 DG |
1738 | verbosity = "--verbose"; |
1739 | } else { | |
1740 | verbosity = "--quiet"; | |
1741 | } | |
3bd1e081 MD |
1742 | switch (consumer_data->type) { |
1743 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1744 | /* |
c7704d57 DG |
1745 | * Find out which consumerd to execute. We will first try the |
1746 | * 64-bit path, then the sessiond's installation directory, and | |
1747 | * fallback on the 32-bit one, | |
94c55f17 | 1748 | */ |
63a799e8 AM |
1749 | DBG3("Looking for a kernel consumer at these locations:"); |
1750 | DBG3(" 1) %s", consumerd64_bin); | |
1751 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1752 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1753 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1754 | DBG3("Found location #1"); |
94c55f17 | 1755 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1756 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1757 | DBG3("Found location #2"); |
94c55f17 | 1758 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1759 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1760 | DBG3("Found location #3"); |
eb1e0bd4 | 1761 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1762 | } else { |
63a799e8 | 1763 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1764 | break; |
1765 | } | |
1766 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1767 | execl(consumer_to_use, | |
1768 | "lttng-consumerd", verbosity, "-k", | |
1769 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1770 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1771 | NULL); | |
3bd1e081 | 1772 | break; |
7753dea8 MD |
1773 | case LTTNG_CONSUMER64_UST: |
1774 | { | |
b1e0b6b6 | 1775 | char *tmpnew = NULL; |
8f4905da MD |
1776 | |
1777 | if (consumerd64_libdir[0] != '\0') { | |
1778 | char *tmp; | |
1779 | size_t tmplen; | |
1780 | ||
1781 | tmp = getenv("LD_LIBRARY_PATH"); | |
1782 | if (!tmp) { | |
1783 | tmp = ""; | |
1784 | } | |
1785 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1786 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1787 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1788 | if (!tmpnew) { | |
1789 | ret = -ENOMEM; | |
1790 | goto error; | |
1791 | } | |
1792 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1793 | strcat(tmpnew, consumerd64_libdir); | |
1794 | if (tmp[0] != '\0') { | |
1795 | strcat(tmpnew, ":"); | |
1796 | strcat(tmpnew, tmp); | |
1797 | } | |
1798 | ret = putenv(tmpnew); | |
1799 | if (ret) { | |
1800 | ret = -errno; | |
1801 | goto error; | |
1802 | } | |
1803 | } | |
94c55f17 | 1804 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1805 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1806 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1807 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1808 | NULL); | |
8f4905da MD |
1809 | if (consumerd64_libdir[0] != '\0') { |
1810 | free(tmpnew); | |
1811 | } | |
1812 | if (ret) { | |
1813 | goto error; | |
1814 | } | |
3bd1e081 | 1815 | break; |
7753dea8 MD |
1816 | } |
1817 | case LTTNG_CONSUMER32_UST: | |
1818 | { | |
937dde8e | 1819 | char *tmpnew = NULL; |
8f4905da MD |
1820 | |
1821 | if (consumerd32_libdir[0] != '\0') { | |
1822 | char *tmp; | |
1823 | size_t tmplen; | |
1824 | ||
1825 | tmp = getenv("LD_LIBRARY_PATH"); | |
1826 | if (!tmp) { | |
1827 | tmp = ""; | |
1828 | } | |
1829 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1830 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1831 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1832 | if (!tmpnew) { | |
1833 | ret = -ENOMEM; | |
1834 | goto error; | |
1835 | } | |
1836 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1837 | strcat(tmpnew, consumerd32_libdir); | |
1838 | if (tmp[0] != '\0') { | |
1839 | strcat(tmpnew, ":"); | |
1840 | strcat(tmpnew, tmp); | |
1841 | } | |
1842 | ret = putenv(tmpnew); | |
1843 | if (ret) { | |
1844 | ret = -errno; | |
1845 | goto error; | |
1846 | } | |
1847 | } | |
94c55f17 | 1848 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1849 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1850 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1851 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1852 | NULL); | |
8f4905da MD |
1853 | if (consumerd32_libdir[0] != '\0') { |
1854 | free(tmpnew); | |
1855 | } | |
1856 | if (ret) { | |
1857 | goto error; | |
1858 | } | |
7753dea8 MD |
1859 | break; |
1860 | } | |
3bd1e081 | 1861 | default: |
76d7553f | 1862 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1863 | exit(EXIT_FAILURE); |
1864 | } | |
8c0faa1d | 1865 | if (errno != 0) { |
76d7553f | 1866 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1867 | } |
1868 | exit(EXIT_FAILURE); | |
1869 | } else if (pid > 0) { | |
1870 | ret = pid; | |
8c0faa1d | 1871 | } else { |
76d7553f | 1872 | PERROR("start consumer fork"); |
8c0faa1d | 1873 | ret = -errno; |
8c0faa1d | 1874 | } |
8f4905da | 1875 | error: |
8c0faa1d DG |
1876 | return ret; |
1877 | } | |
1878 | ||
693bd40b | 1879 | /* |
3bd1e081 | 1880 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1881 | */ |
3bd1e081 | 1882 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1883 | { |
c617c0c6 | 1884 | int ret; |
edb8b045 DG |
1885 | |
1886 | /* | |
1887 | * Set the listen() state on the socket since there is a possible race | |
1888 | * between the exec() of the consumer daemon and this call if place in the | |
1889 | * consumer thread. See bug #366 for more details. | |
1890 | */ | |
1891 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1892 | if (ret < 0) { | |
1893 | goto error; | |
1894 | } | |
693bd40b | 1895 | |
3bd1e081 MD |
1896 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1897 | if (consumer_data->pid != 0) { | |
1898 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1899 | goto end; |
1900 | } | |
693bd40b | 1901 | |
3bd1e081 | 1902 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1903 | if (ret < 0) { |
3bd1e081 MD |
1904 | ERR("Spawning consumerd failed"); |
1905 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1906 | goto error; |
693bd40b | 1907 | } |
c49dc785 | 1908 | |
3bd1e081 MD |
1909 | /* Setting up the consumer_data pid */ |
1910 | consumer_data->pid = ret; | |
48842b30 | 1911 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1912 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1913 | |
3bd1e081 MD |
1914 | DBG2("Spawning consumer control thread"); |
1915 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1916 | if (ret < 0) { |
3bd1e081 | 1917 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1918 | goto error; |
1919 | } | |
1920 | ||
c49dc785 | 1921 | end: |
693bd40b DG |
1922 | return 0; |
1923 | ||
1924 | error: | |
edb8b045 DG |
1925 | /* Cleanup already created socket on error. */ |
1926 | if (consumer_data->err_sock >= 0) { | |
c617c0c6 MD |
1927 | int err; |
1928 | ||
edb8b045 DG |
1929 | err = close(consumer_data->err_sock); |
1930 | if (err < 0) { | |
1931 | PERROR("close consumer data error socket"); | |
1932 | } | |
1933 | } | |
693bd40b DG |
1934 | return ret; |
1935 | } | |
1936 | ||
44a5e5eb | 1937 | /* |
139ac872 MD |
1938 | * Compute health status of each consumer. If one of them is zero (bad |
1939 | * state), we return 0. | |
44a5e5eb DG |
1940 | */ |
1941 | static int check_consumer_health(void) | |
1942 | { | |
1943 | int ret; | |
1944 | ||
927ca06a | 1945 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
1946 | |
1947 | DBG3("Health consumer check %d", ret); | |
1948 | ||
1949 | return ret; | |
1950 | } | |
1951 | ||
b73401da | 1952 | /* |
096102bd | 1953 | * Setup necessary data for kernel tracer action. |
b73401da | 1954 | */ |
096102bd | 1955 | static int init_kernel_tracer(void) |
b73401da DG |
1956 | { |
1957 | int ret; | |
b73401da | 1958 | |
096102bd DG |
1959 | /* Modprobe lttng kernel modules */ |
1960 | ret = modprobe_lttng_control(); | |
b73401da | 1961 | if (ret < 0) { |
b73401da DG |
1962 | goto error; |
1963 | } | |
1964 | ||
096102bd DG |
1965 | /* Open debugfs lttng */ |
1966 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1967 | if (kernel_tracer_fd < 0) { | |
1968 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1969 | ret = -1; |
1970 | goto error_open; | |
54d01ffb DG |
1971 | } |
1972 | ||
2f77fc4b DG |
1973 | /* Validate kernel version */ |
1974 | ret = kernel_validate_version(kernel_tracer_fd); | |
1975 | if (ret < 0) { | |
1976 | goto error_version; | |
b551a063 | 1977 | } |
54d01ffb | 1978 | |
2f77fc4b DG |
1979 | ret = modprobe_lttng_data(); |
1980 | if (ret < 0) { | |
1981 | goto error_modules; | |
54d01ffb DG |
1982 | } |
1983 | ||
2f77fc4b DG |
1984 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1985 | return 0; | |
1986 | ||
1987 | error_version: | |
1988 | modprobe_remove_lttng_control(); | |
1989 | ret = close(kernel_tracer_fd); | |
1990 | if (ret) { | |
1991 | PERROR("close"); | |
b551a063 | 1992 | } |
2f77fc4b | 1993 | kernel_tracer_fd = -1; |
f73fabfd | 1994 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 1995 | |
2f77fc4b DG |
1996 | error_modules: |
1997 | ret = close(kernel_tracer_fd); | |
1998 | if (ret) { | |
1999 | PERROR("close"); | |
b551a063 | 2000 | } |
54d01ffb | 2001 | |
2f77fc4b DG |
2002 | error_open: |
2003 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2004 | |
2005 | error: | |
2f77fc4b DG |
2006 | WARN("No kernel tracer available"); |
2007 | kernel_tracer_fd = -1; | |
2008 | if (!is_root) { | |
f73fabfd | 2009 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2010 | } else { |
f73fabfd | 2011 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2012 | } |
54d01ffb DG |
2013 | } |
2014 | ||
2f77fc4b | 2015 | |
54d01ffb | 2016 | /* |
2f77fc4b DG |
2017 | * Copy consumer output from the tracing session to the domain session. The |
2018 | * function also applies the right modification on a per domain basis for the | |
2019 | * trace files destination directory. | |
54d01ffb | 2020 | */ |
2f77fc4b | 2021 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2022 | { |
2023 | int ret; | |
2f77fc4b DG |
2024 | const char *dir_name; |
2025 | struct consumer_output *consumer; | |
2026 | ||
2027 | assert(session); | |
2028 | assert(session->consumer); | |
54d01ffb | 2029 | |
b551a063 DG |
2030 | switch (domain) { |
2031 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2032 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2033 | /* |
2034 | * XXX: We should audit the session creation and what this function | |
2035 | * does "extra" in order to avoid a destroy since this function is used | |
2036 | * in the domain session creation (kernel and ust) only. Same for UST | |
2037 | * domain. | |
2038 | */ | |
2039 | if (session->kernel_session->consumer) { | |
2040 | consumer_destroy_output(session->kernel_session->consumer); | |
2041 | } | |
2f77fc4b DG |
2042 | session->kernel_session->consumer = |
2043 | consumer_copy_output(session->consumer); | |
2044 | /* Ease our life a bit for the next part */ | |
2045 | consumer = session->kernel_session->consumer; | |
2046 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2047 | break; |
2048 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2049 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2050 | if (session->ust_session->consumer) { |
2051 | consumer_destroy_output(session->ust_session->consumer); | |
2052 | } | |
2f77fc4b DG |
2053 | session->ust_session->consumer = |
2054 | consumer_copy_output(session->consumer); | |
2055 | /* Ease our life a bit for the next part */ | |
2056 | consumer = session->ust_session->consumer; | |
2057 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2058 | break; |
2059 | default: | |
f73fabfd | 2060 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2061 | goto error; |
2062 | } | |
2063 | ||
2f77fc4b | 2064 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2065 | strncat(consumer->subdir, dir_name, |
2066 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2067 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2068 | ||
f73fabfd | 2069 | ret = LTTNG_OK; |
54d01ffb DG |
2070 | |
2071 | error: | |
2072 | return ret; | |
2073 | } | |
2074 | ||
00e2e675 | 2075 | /* |
2f77fc4b | 2076 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2077 | */ |
2f77fc4b DG |
2078 | static int create_ust_session(struct ltt_session *session, |
2079 | struct lttng_domain *domain) | |
00e2e675 DG |
2080 | { |
2081 | int ret; | |
2f77fc4b | 2082 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2083 | |
a4b92340 | 2084 | assert(session); |
2f77fc4b DG |
2085 | assert(domain); |
2086 | assert(session->consumer); | |
a4b92340 | 2087 | |
2f77fc4b DG |
2088 | switch (domain->type) { |
2089 | case LTTNG_DOMAIN_UST: | |
2090 | break; | |
2091 | default: | |
2092 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2093 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2094 | goto error; |
2095 | } | |
2096 | ||
2f77fc4b DG |
2097 | DBG("Creating UST session"); |
2098 | ||
fdd9eb17 | 2099 | lus = trace_ust_create_session(session->path, session->id); |
2f77fc4b | 2100 | if (lus == NULL) { |
f73fabfd | 2101 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2102 | goto error; |
2103 | } | |
2104 | ||
2f77fc4b DG |
2105 | lus->uid = session->uid; |
2106 | lus->gid = session->gid; | |
2107 | session->ust_session = lus; | |
00e2e675 | 2108 | |
2f77fc4b DG |
2109 | /* Copy session output to the newly created UST session */ |
2110 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2111 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2112 | goto error; |
2113 | } | |
2114 | ||
f73fabfd | 2115 | return LTTNG_OK; |
00e2e675 DG |
2116 | |
2117 | error: | |
2f77fc4b DG |
2118 | free(lus); |
2119 | session->ust_session = NULL; | |
00e2e675 DG |
2120 | return ret; |
2121 | } | |
2122 | ||
2123 | /* | |
2f77fc4b | 2124 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2125 | */ |
2f77fc4b | 2126 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2127 | { |
2128 | int ret; | |
a4b92340 | 2129 | |
2f77fc4b | 2130 | DBG("Creating kernel session"); |
00e2e675 | 2131 | |
2f77fc4b DG |
2132 | ret = kernel_create_session(session, kernel_tracer_fd); |
2133 | if (ret < 0) { | |
f73fabfd | 2134 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2135 | goto error; |
2136 | } | |
2137 | ||
2f77fc4b DG |
2138 | /* Code flow safety */ |
2139 | assert(session->kernel_session); | |
2140 | ||
2141 | /* Copy session output to the newly created Kernel session */ | |
2142 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2143 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2144 | goto error; |
2145 | } | |
2146 | ||
2f77fc4b DG |
2147 | /* Create directory(ies) on local filesystem. */ |
2148 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2149 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2150 | ret = run_as_mkdir_recursive( | |
2151 | session->kernel_session->consumer->dst.trace_path, | |
2152 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2153 | if (ret < 0) { | |
2154 | if (ret != -EEXIST) { | |
2155 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2156 | goto error; |
2157 | } | |
00e2e675 | 2158 | } |
2f77fc4b | 2159 | } |
00e2e675 | 2160 | |
2f77fc4b DG |
2161 | session->kernel_session->uid = session->uid; |
2162 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2163 | |
f73fabfd | 2164 | return LTTNG_OK; |
00e2e675 | 2165 | |
2f77fc4b DG |
2166 | error: |
2167 | trace_kernel_destroy_session(session->kernel_session); | |
2168 | session->kernel_session = NULL; | |
2169 | return ret; | |
2170 | } | |
00e2e675 | 2171 | |
2f77fc4b DG |
2172 | /* |
2173 | * Count number of session permitted by uid/gid. | |
2174 | */ | |
2175 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2176 | { | |
2177 | unsigned int i = 0; | |
2178 | struct ltt_session *session; | |
07424f16 | 2179 | |
2f77fc4b DG |
2180 | DBG("Counting number of available session for UID %d GID %d", |
2181 | uid, gid); | |
2182 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2183 | /* |
2f77fc4b | 2184 | * Only list the sessions the user can control. |
00e2e675 | 2185 | */ |
2f77fc4b DG |
2186 | if (!session_access_ok(session, uid, gid)) { |
2187 | continue; | |
2188 | } | |
2189 | i++; | |
a4b92340 | 2190 | } |
2f77fc4b | 2191 | return i; |
00e2e675 DG |
2192 | } |
2193 | ||
54d01ffb DG |
2194 | /* |
2195 | * Process the command requested by the lttng client within the command | |
2196 | * context structure. This function make sure that the return structure (llm) | |
2197 | * is set and ready for transmission before returning. | |
2198 | * | |
2199 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2200 | * |
2201 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2202 | */ |
53a80697 MD |
2203 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2204 | int *sock_error) | |
54d01ffb | 2205 | { |
f73fabfd | 2206 | int ret = LTTNG_OK; |
44d3bd01 | 2207 | int need_tracing_session = 1; |
2e09ba09 | 2208 | int need_domain; |
54d01ffb DG |
2209 | |
2210 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2211 | ||
53a80697 MD |
2212 | *sock_error = 0; |
2213 | ||
2e09ba09 MD |
2214 | switch (cmd_ctx->lsm->cmd_type) { |
2215 | case LTTNG_CREATE_SESSION: | |
2216 | case LTTNG_DESTROY_SESSION: | |
2217 | case LTTNG_LIST_SESSIONS: | |
2218 | case LTTNG_LIST_DOMAINS: | |
2219 | case LTTNG_START_TRACE: | |
2220 | case LTTNG_STOP_TRACE: | |
6d805429 | 2221 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2222 | need_domain = 0; |
3aace903 | 2223 | break; |
2e09ba09 MD |
2224 | default: |
2225 | need_domain = 1; | |
2226 | } | |
2227 | ||
2228 | if (opt_no_kernel && need_domain | |
2229 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2230 | if (!is_root) { |
f73fabfd | 2231 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2232 | } else { |
f73fabfd | 2233 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2234 | } |
4fba7219 DG |
2235 | goto error; |
2236 | } | |
2237 | ||
8d3113b2 DG |
2238 | /* Deny register consumer if we already have a spawned consumer. */ |
2239 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2240 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2241 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2242 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2243 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2244 | goto error; |
2245 | } | |
2246 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2247 | } | |
2248 | ||
54d01ffb DG |
2249 | /* |
2250 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2251 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2252 | * command. |
2253 | */ | |
2254 | switch(cmd_ctx->lsm->cmd_type) { | |
2255 | case LTTNG_LIST_SESSIONS: | |
2256 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2257 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2258 | case LTTNG_LIST_DOMAINS: |
2259 | case LTTNG_LIST_CHANNELS: | |
2260 | case LTTNG_LIST_EVENTS: | |
2261 | break; | |
2262 | default: | |
2263 | /* Setup lttng message with no payload */ | |
2264 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2265 | if (ret < 0) { | |
2266 | /* This label does not try to unlock the session */ | |
2267 | goto init_setup_error; | |
2268 | } | |
2269 | } | |
2270 | ||
2271 | /* Commands that DO NOT need a session. */ | |
2272 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2273 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2274 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2275 | case LTTNG_LIST_SESSIONS: |
2276 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2277 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2278 | need_tracing_session = 0; |
54d01ffb DG |
2279 | break; |
2280 | default: | |
2281 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2282 | /* |
2283 | * We keep the session list lock across _all_ commands | |
2284 | * for now, because the per-session lock does not | |
2285 | * handle teardown properly. | |
2286 | */ | |
74babd95 | 2287 | session_lock_list(); |
54d01ffb DG |
2288 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2289 | if (cmd_ctx->session == NULL) { | |
2290 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2291 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2292 | } else { |
2293 | /* If no session name specified */ | |
f73fabfd | 2294 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2295 | } |
2296 | goto error; | |
2297 | } else { | |
2298 | /* Acquire lock for the session */ | |
2299 | session_lock(cmd_ctx->session); | |
2300 | } | |
2301 | break; | |
2302 | } | |
b389abbe | 2303 | |
2e09ba09 MD |
2304 | if (!need_domain) { |
2305 | goto skip_domain; | |
2306 | } | |
a4b92340 | 2307 | |
54d01ffb DG |
2308 | /* |
2309 | * Check domain type for specific "pre-action". | |
2310 | */ | |
2311 | switch (cmd_ctx->lsm->domain.type) { | |
2312 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2313 | if (!is_root) { |
f73fabfd | 2314 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2315 | goto error; |
2316 | } | |
2317 | ||
54d01ffb | 2318 | /* Kernel tracer check */ |
a4b35e07 | 2319 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2320 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2321 | ret = init_kernel_tracer(); |
2322 | if (ret != 0) { | |
54d01ffb DG |
2323 | goto error; |
2324 | } | |
2325 | } | |
5eb91c98 | 2326 | |
5c827ce0 DG |
2327 | /* Consumer is in an ERROR state. Report back to client */ |
2328 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2329 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2330 | goto error; |
2331 | } | |
2332 | ||
54d01ffb | 2333 | /* Need a session for kernel command */ |
44d3bd01 | 2334 | if (need_tracing_session) { |
54d01ffb | 2335 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2336 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2337 | if (ret < 0) { |
f73fabfd | 2338 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2339 | goto error; |
2340 | } | |
b389abbe | 2341 | } |
7d29a247 | 2342 | |
54d01ffb | 2343 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2344 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2345 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2346 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2347 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2348 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2349 | if (ret < 0) { |
f73fabfd | 2350 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2351 | goto error; |
950131af | 2352 | } |
5c827ce0 | 2353 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2354 | } else { |
2355 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2356 | } |
173af62f | 2357 | |
a4b92340 DG |
2358 | /* |
2359 | * The consumer was just spawned so we need to add the socket to | |
2360 | * the consumer output of the session if exist. | |
2361 | */ | |
2362 | ret = consumer_create_socket(&kconsumer_data, | |
2363 | cmd_ctx->session->kernel_session->consumer); | |
2364 | if (ret < 0) { | |
2365 | goto error; | |
173af62f | 2366 | } |
0d0c377a | 2367 | } |
5c827ce0 | 2368 | |
54d01ffb | 2369 | break; |
2bdd86d4 | 2370 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2371 | { |
5c827ce0 DG |
2372 | /* Consumer is in an ERROR state. Report back to client */ |
2373 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2374 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2375 | goto error; |
2376 | } | |
2377 | ||
44d3bd01 | 2378 | if (need_tracing_session) { |
a4b92340 | 2379 | /* Create UST session if none exist. */ |
f6a9efaa | 2380 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2381 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2382 | &cmd_ctx->lsm->domain); |
f73fabfd | 2383 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2384 | goto error; |
2385 | } | |
2386 | } | |
00e2e675 | 2387 | |
7753dea8 MD |
2388 | /* Start the UST consumer daemons */ |
2389 | /* 64-bit */ | |
2390 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2391 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2392 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2393 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2394 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2395 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2396 | if (ret < 0) { |
f73fabfd | 2397 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2398 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2399 | goto error; |
2400 | } | |
48842b30 | 2401 | |
173af62f | 2402 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2403 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2404 | } else { |
7753dea8 MD |
2405 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2406 | } | |
173af62f DG |
2407 | |
2408 | /* | |
2409 | * Setup socket for consumer 64 bit. No need for atomic access | |
2410 | * since it was set above and can ONLY be set in this thread. | |
2411 | */ | |
a4b92340 DG |
2412 | ret = consumer_create_socket(&ustconsumer64_data, |
2413 | cmd_ctx->session->ust_session->consumer); | |
2414 | if (ret < 0) { | |
2415 | goto error; | |
173af62f DG |
2416 | } |
2417 | ||
7753dea8 | 2418 | /* 32-bit */ |
fc7a59ce | 2419 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2420 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2421 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2422 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2423 | ret = start_consumerd(&ustconsumer32_data); | |
2424 | if (ret < 0) { | |
f73fabfd | 2425 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2426 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2427 | goto error; |
2428 | } | |
5c827ce0 | 2429 | |
173af62f | 2430 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2431 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2432 | } else { |
2433 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2434 | } |
173af62f DG |
2435 | |
2436 | /* | |
2437 | * Setup socket for consumer 64 bit. No need for atomic access | |
2438 | * since it was set above and can ONLY be set in this thread. | |
2439 | */ | |
a4b92340 DG |
2440 | ret = consumer_create_socket(&ustconsumer32_data, |
2441 | cmd_ctx->session->ust_session->consumer); | |
2442 | if (ret < 0) { | |
2443 | goto error; | |
173af62f | 2444 | } |
44d3bd01 DG |
2445 | } |
2446 | break; | |
48842b30 | 2447 | } |
54d01ffb | 2448 | default: |
54d01ffb DG |
2449 | break; |
2450 | } | |
2e09ba09 | 2451 | skip_domain: |
33a2b854 | 2452 | |
5c827ce0 DG |
2453 | /* Validate consumer daemon state when start/stop trace command */ |
2454 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2455 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2456 | switch (cmd_ctx->lsm->domain.type) { | |
2457 | case LTTNG_DOMAIN_UST: | |
2458 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2459 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2460 | goto error; |
2461 | } | |
2462 | break; | |
2463 | case LTTNG_DOMAIN_KERNEL: | |
2464 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2465 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2466 | goto error; |
2467 | } | |
2468 | break; | |
2469 | } | |
2470 | } | |
2471 | ||
8e0af1b4 MD |
2472 | /* |
2473 | * Check that the UID or GID match that of the tracing session. | |
2474 | * The root user can interact with all sessions. | |
2475 | */ | |
2476 | if (need_tracing_session) { | |
2477 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2478 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2479 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2480 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2481 | goto error; |
2482 | } | |
2483 | } | |
2484 | ||
ffe60014 DG |
2485 | /* |
2486 | * Send relayd information to consumer as soon as we have a domain and a | |
2487 | * session defined. | |
2488 | */ | |
2489 | if (cmd_ctx->session && need_domain) { | |
2490 | /* | |
2491 | * Setup relayd if not done yet. If the relayd information was already | |
2492 | * sent to the consumer, this call will gracefully return. | |
2493 | */ | |
2494 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2495 | if (ret != LTTNG_OK) { | |
2496 | goto error; | |
2497 | } | |
2498 | } | |
2499 | ||
54d01ffb DG |
2500 | /* Process by command type */ |
2501 | switch (cmd_ctx->lsm->cmd_type) { | |
2502 | case LTTNG_ADD_CONTEXT: | |
2503 | { | |
2504 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2505 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2506 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2507 | break; |
2508 | } | |
2509 | case LTTNG_DISABLE_CHANNEL: | |
2510 | { | |
2511 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2512 | cmd_ctx->lsm->u.disable.channel_name); | |
2513 | break; | |
2514 | } | |
2515 | case LTTNG_DISABLE_EVENT: | |
2516 | { | |
2517 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2518 | cmd_ctx->lsm->u.disable.channel_name, | |
2519 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2520 | break; |
2521 | } | |
54d01ffb DG |
2522 | case LTTNG_DISABLE_ALL_EVENT: |
2523 | { | |
2bdd86d4 | 2524 | DBG("Disabling all events"); |
54d01ffb DG |
2525 | |
2526 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2527 | cmd_ctx->lsm->u.disable.channel_name); | |
2528 | break; | |
2529 | } | |
2530 | case LTTNG_ENABLE_CHANNEL: | |
2531 | { | |
aea829b3 | 2532 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2533 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2534 | break; |
2535 | } | |
2536 | case LTTNG_ENABLE_EVENT: | |
2537 | { | |
2538 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2539 | cmd_ctx->lsm->u.enable.channel_name, | |
025faf73 | 2540 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2541 | break; |
2542 | } | |
2543 | case LTTNG_ENABLE_ALL_EVENT: | |
2544 | { | |
2bdd86d4 | 2545 | DBG("Enabling all events"); |
54d01ffb DG |
2546 | |
2547 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2548 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2549 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2550 | break; |
2551 | } | |
052da939 | 2552 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2553 | { |
9f19cc17 | 2554 | struct lttng_event *events; |
54d01ffb | 2555 | ssize_t nb_events; |
052da939 | 2556 | |
54d01ffb DG |
2557 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2558 | if (nb_events < 0) { | |
f73fabfd | 2559 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2560 | ret = -nb_events; |
2561 | goto error; | |
2ef84c95 DG |
2562 | } |
2563 | ||
2564 | /* | |
2565 | * Setup lttng message with payload size set to the event list size in | |
2566 | * bytes and then copy list into the llm payload. | |
2567 | */ | |
052da939 | 2568 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2569 | if (ret < 0) { |
052da939 | 2570 | free(events); |
2ef84c95 DG |
2571 | goto setup_error; |
2572 | } | |
2573 | ||
2574 | /* Copy event list into message payload */ | |
9f19cc17 | 2575 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2576 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2577 | |
9f19cc17 | 2578 | free(events); |
2ef84c95 | 2579 | |
f73fabfd | 2580 | ret = LTTNG_OK; |
2ef84c95 DG |
2581 | break; |
2582 | } | |
f37d259d MD |
2583 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2584 | { | |
2585 | struct lttng_event_field *fields; | |
2586 | ssize_t nb_fields; | |
2587 | ||
a4b92340 DG |
2588 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2589 | &fields); | |
f37d259d | 2590 | if (nb_fields < 0) { |
f73fabfd | 2591 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2592 | ret = -nb_fields; |
2593 | goto error; | |
2594 | } | |
2595 | ||
2596 | /* | |
2597 | * Setup lttng message with payload size set to the event list size in | |
2598 | * bytes and then copy list into the llm payload. | |
2599 | */ | |
a4b92340 DG |
2600 | ret = setup_lttng_msg(cmd_ctx, |
2601 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2602 | if (ret < 0) { |
2603 | free(fields); | |
2604 | goto setup_error; | |
2605 | } | |
2606 | ||
2607 | /* Copy event list into message payload */ | |
2608 | memcpy(cmd_ctx->llm->payload, fields, | |
2609 | sizeof(struct lttng_event_field) * nb_fields); | |
2610 | ||
2611 | free(fields); | |
2612 | ||
f73fabfd | 2613 | ret = LTTNG_OK; |
f37d259d MD |
2614 | break; |
2615 | } | |
00e2e675 DG |
2616 | case LTTNG_SET_CONSUMER_URI: |
2617 | { | |
a4b92340 DG |
2618 | size_t nb_uri, len; |
2619 | struct lttng_uri *uris; | |
2620 | ||
2621 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2622 | len = nb_uri * sizeof(struct lttng_uri); | |
2623 | ||
2624 | if (nb_uri == 0) { | |
f73fabfd | 2625 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2626 | goto error; |
2627 | } | |
2628 | ||
2629 | uris = zmalloc(len); | |
2630 | if (uris == NULL) { | |
f73fabfd | 2631 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2632 | goto error; |
2633 | } | |
2634 | ||
2635 | /* Receive variable len data */ | |
77c7c900 | 2636 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2637 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2638 | if (ret <= 0) { | |
2639 | DBG("No URIs received from client... continuing"); | |
2640 | *sock_error = 1; | |
f73fabfd | 2641 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2642 | free(uris); |
a4b92340 DG |
2643 | goto error; |
2644 | } | |
2645 | ||
00e2e675 | 2646 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2647 | nb_uri, uris); |
f73fabfd | 2648 | if (ret != LTTNG_OK) { |
b1d41407 | 2649 | free(uris); |
a4b92340 DG |
2650 | goto error; |
2651 | } | |
2652 | ||
2653 | /* | |
2654 | * XXX: 0 means that this URI should be applied on the session. Should | |
2655 | * be a DOMAIN enuam. | |
2656 | */ | |
2657 | if (cmd_ctx->lsm->domain.type == 0) { | |
2658 | /* Add the URI for the UST session if a consumer is present. */ | |
2659 | if (cmd_ctx->session->ust_session && | |
2660 | cmd_ctx->session->ust_session->consumer) { | |
2661 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2662 | nb_uri, uris); | |
2663 | } else if (cmd_ctx->session->kernel_session && | |
2664 | cmd_ctx->session->kernel_session->consumer) { | |
2665 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2666 | cmd_ctx->session, nb_uri, uris); | |
2667 | } | |
2668 | } | |
2669 | ||
b1d41407 DG |
2670 | free(uris); |
2671 | ||
00e2e675 DG |
2672 | break; |
2673 | } | |
f3ed775e | 2674 | case LTTNG_START_TRACE: |
8c0faa1d | 2675 | { |
54d01ffb | 2676 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2677 | break; |
2678 | } | |
f3ed775e | 2679 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2680 | { |
54d01ffb | 2681 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2682 | break; |
2683 | } | |
5e16da05 MD |
2684 | case LTTNG_CREATE_SESSION: |
2685 | { | |
a4b92340 DG |
2686 | size_t nb_uri, len; |
2687 | struct lttng_uri *uris = NULL; | |
2688 | ||
2689 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2690 | len = nb_uri * sizeof(struct lttng_uri); | |
2691 | ||
2692 | if (nb_uri > 0) { | |
2693 | uris = zmalloc(len); | |
2694 | if (uris == NULL) { | |
f73fabfd | 2695 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2696 | goto error; |
2697 | } | |
2698 | ||
2699 | /* Receive variable len data */ | |
77c7c900 | 2700 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2701 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2702 | if (ret <= 0) { | |
2703 | DBG("No URIs received from client... continuing"); | |
2704 | *sock_error = 1; | |
f73fabfd | 2705 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2706 | free(uris); |
a4b92340 DG |
2707 | goto error; |
2708 | } | |
2709 | ||
2710 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2711 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2712 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2713 | free(uris); |
a4b92340 DG |
2714 | goto error; |
2715 | } | |
2716 | } | |
2717 | ||
2718 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2719 | &cmd_ctx->creds); | |
2720 | ||
b1d41407 DG |
2721 | free(uris); |
2722 | ||
00e2e675 DG |
2723 | break; |
2724 | } | |
5e16da05 MD |
2725 | case LTTNG_DESTROY_SESSION: |
2726 | { | |
2f77fc4b | 2727 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2728 | |
2729 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2730 | cmd_ctx->session = NULL; |
5461b305 | 2731 | break; |
5e16da05 | 2732 | } |
9f19cc17 | 2733 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2734 | { |
54d01ffb DG |
2735 | ssize_t nb_dom; |
2736 | struct lttng_domain *domains; | |
5461b305 | 2737 | |
54d01ffb DG |
2738 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2739 | if (nb_dom < 0) { | |
f73fabfd | 2740 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2741 | ret = -nb_dom; |
2742 | goto error; | |
ce3d728c | 2743 | } |
520ff687 | 2744 | |
54d01ffb | 2745 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2746 | if (ret < 0) { |
2747 | goto setup_error; | |
520ff687 | 2748 | } |
57167058 | 2749 | |
54d01ffb DG |
2750 | /* Copy event list into message payload */ |
2751 | memcpy(cmd_ctx->llm->payload, domains, | |
2752 | nb_dom * sizeof(struct lttng_domain)); | |
2753 | ||
2754 | free(domains); | |
5e16da05 | 2755 | |
f73fabfd | 2756 | ret = LTTNG_OK; |
5e16da05 MD |
2757 | break; |
2758 | } | |
9f19cc17 | 2759 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2760 | { |
6775595e | 2761 | int nb_chan; |
54d01ffb DG |
2762 | struct lttng_channel *channels; |
2763 | ||
b551a063 DG |
2764 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2765 | cmd_ctx->session, &channels); | |
54d01ffb | 2766 | if (nb_chan < 0) { |
f73fabfd | 2767 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2768 | ret = -nb_chan; |
2769 | goto error; | |
5461b305 | 2770 | } |
ca95a216 | 2771 | |
54d01ffb | 2772 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2773 | if (ret < 0) { |
2774 | goto setup_error; | |
2775 | } | |
9f19cc17 | 2776 | |
54d01ffb DG |
2777 | /* Copy event list into message payload */ |
2778 | memcpy(cmd_ctx->llm->payload, channels, | |
2779 | nb_chan * sizeof(struct lttng_channel)); | |
2780 | ||
2781 | free(channels); | |
9f19cc17 | 2782 | |
f73fabfd | 2783 | ret = LTTNG_OK; |
5461b305 | 2784 | break; |
5e16da05 | 2785 | } |
9f19cc17 | 2786 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2787 | { |
b551a063 | 2788 | ssize_t nb_event; |
684d34d2 | 2789 | struct lttng_event *events = NULL; |
9f19cc17 | 2790 | |
b551a063 | 2791 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2792 | cmd_ctx->lsm->u.list.channel_name, &events); |
2793 | if (nb_event < 0) { | |
f73fabfd | 2794 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2795 | ret = -nb_event; |
2796 | goto error; | |
5461b305 | 2797 | } |
ca95a216 | 2798 | |
54d01ffb | 2799 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2800 | if (ret < 0) { |
2801 | goto setup_error; | |
2802 | } | |
9f19cc17 | 2803 | |
54d01ffb DG |
2804 | /* Copy event list into message payload */ |
2805 | memcpy(cmd_ctx->llm->payload, events, | |
2806 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2807 | |
54d01ffb | 2808 | free(events); |
9f19cc17 | 2809 | |
f73fabfd | 2810 | ret = LTTNG_OK; |
5461b305 | 2811 | break; |
5e16da05 MD |
2812 | } |
2813 | case LTTNG_LIST_SESSIONS: | |
2814 | { | |
8e0af1b4 | 2815 | unsigned int nr_sessions; |
5461b305 | 2816 | |
8e0af1b4 | 2817 | session_lock_list(); |
730389d9 DG |
2818 | nr_sessions = lttng_sessions_count( |
2819 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2820 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2821 | |
8e0af1b4 | 2822 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2823 | if (ret < 0) { |
54d01ffb | 2824 | session_unlock_list(); |
5461b305 | 2825 | goto setup_error; |
e065084a | 2826 | } |
5e16da05 | 2827 | |
6c9cc2ab | 2828 | /* Filled the session array */ |
2f77fc4b | 2829 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2830 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2831 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2832 | |
54d01ffb | 2833 | session_unlock_list(); |
5e16da05 | 2834 | |
f73fabfd | 2835 | ret = LTTNG_OK; |
5e16da05 MD |
2836 | break; |
2837 | } | |
d0254c7c MD |
2838 | case LTTNG_CALIBRATE: |
2839 | { | |
54d01ffb DG |
2840 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2841 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2842 | break; |
2843 | } | |
d9800920 DG |
2844 | case LTTNG_REGISTER_CONSUMER: |
2845 | { | |
2f77fc4b DG |
2846 | struct consumer_data *cdata; |
2847 | ||
2848 | switch (cmd_ctx->lsm->domain.type) { | |
2849 | case LTTNG_DOMAIN_KERNEL: | |
2850 | cdata = &kconsumer_data; | |
2851 | break; | |
2852 | default: | |
f73fabfd | 2853 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2854 | goto error; |
2855 | } | |
2856 | ||
54d01ffb | 2857 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2858 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2859 | break; |
2860 | } | |
025faf73 | 2861 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2862 | { |
2863 | struct lttng_filter_bytecode *bytecode; | |
2864 | ||
025faf73 | 2865 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2866 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2867 | goto error; |
2868 | } | |
52df2401 MD |
2869 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2870 | ret = LTTNG_ERR_FILTER_INVAL; | |
2871 | goto error; | |
2872 | } | |
025faf73 | 2873 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2874 | if (!bytecode) { |
f73fabfd | 2875 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2876 | goto error; |
2877 | } | |
2878 | /* Receive var. len. data */ | |
2879 | DBG("Receiving var len data from client ..."); | |
2880 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2881 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2882 | if (ret <= 0) { |
2883 | DBG("Nothing recv() from client var len data... continuing"); | |
2884 | *sock_error = 1; | |
f73fabfd | 2885 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2886 | goto error; |
2887 | } | |
2888 | ||
2889 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2890 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2891 | free(bytecode); |
f73fabfd | 2892 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2893 | goto error; |
2894 | } | |
2895 | ||
025faf73 DG |
2896 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2897 | cmd_ctx->lsm->u.enable.channel_name, | |
2898 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2899 | break; |
2900 | } | |
6d805429 | 2901 | case LTTNG_DATA_PENDING: |
806e2684 | 2902 | { |
6d805429 | 2903 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2904 | break; |
2905 | } | |
5e16da05 | 2906 | default: |
f73fabfd | 2907 | ret = LTTNG_ERR_UND; |
5461b305 | 2908 | break; |
fac6795d DG |
2909 | } |
2910 | ||
5461b305 | 2911 | error: |
5461b305 DG |
2912 | if (cmd_ctx->llm == NULL) { |
2913 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2914 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2915 | goto setup_error; |
2916 | } | |
2917 | } | |
54d01ffb | 2918 | /* Set return code */ |
5461b305 | 2919 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2920 | setup_error: |
b5541356 | 2921 | if (cmd_ctx->session) { |
54d01ffb | 2922 | session_unlock(cmd_ctx->session); |
b5541356 | 2923 | } |
256a5576 MD |
2924 | if (need_tracing_session) { |
2925 | session_unlock_list(); | |
2926 | } | |
54d01ffb | 2927 | init_setup_error: |
8028d920 | 2928 | return ret; |
fac6795d DG |
2929 | } |
2930 | ||
44a5e5eb DG |
2931 | /* |
2932 | * Thread managing health check socket. | |
2933 | */ | |
2934 | static void *thread_manage_health(void *data) | |
2935 | { | |
eb4a2943 | 2936 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2937 | uint32_t revents, nb_fd; |
2938 | struct lttng_poll_event events; | |
2939 | struct lttcomm_health_msg msg; | |
2940 | struct lttcomm_health_data reply; | |
2941 | ||
2942 | DBG("[thread] Manage health check started"); | |
2943 | ||
2944 | rcu_register_thread(); | |
2945 | ||
2946 | /* Create unix socket */ | |
2947 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2948 | if (sock < 0) { | |
2949 | ERR("Unable to create health check Unix socket"); | |
2950 | ret = -1; | |
2951 | goto error; | |
2952 | } | |
2953 | ||
b662582b DG |
2954 | /* |
2955 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2956 | * show must go on. | |
2957 | */ | |
2958 | (void) utils_set_fd_cloexec(sock); | |
2959 | ||
44a5e5eb DG |
2960 | ret = lttcomm_listen_unix_sock(sock); |
2961 | if (ret < 0) { | |
2962 | goto error; | |
2963 | } | |
2964 | ||
2965 | /* | |
2966 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2967 | * more will be added to this poll set. | |
2968 | */ | |
2969 | ret = create_thread_poll_set(&events, 2); | |
2970 | if (ret < 0) { | |
2971 | goto error; | |
2972 | } | |
2973 | ||
2974 | /* Add the application registration socket */ | |
2975 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
2976 | if (ret < 0) { | |
2977 | goto error; | |
2978 | } | |
2979 | ||
2980 | while (1) { | |
2981 | DBG("Health check ready"); | |
2982 | ||
44a5e5eb DG |
2983 | /* Inifinite blocking call, waiting for transmission */ |
2984 | restart: | |
2985 | ret = lttng_poll_wait(&events, -1); | |
2986 | if (ret < 0) { | |
2987 | /* | |
2988 | * Restart interrupted system call. | |
2989 | */ | |
2990 | if (errno == EINTR) { | |
2991 | goto restart; | |
2992 | } | |
2993 | goto error; | |
2994 | } | |
2995 | ||
0d9c5d77 DG |
2996 | nb_fd = ret; |
2997 | ||
44a5e5eb DG |
2998 | for (i = 0; i < nb_fd; i++) { |
2999 | /* Fetch once the poll data */ | |
3000 | revents = LTTNG_POLL_GETEV(&events, i); | |
3001 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3002 | ||
3003 | /* Thread quit pipe has been closed. Killing thread. */ | |
3004 | ret = check_thread_quit_pipe(pollfd, revents); | |
3005 | if (ret) { | |
139ac872 MD |
3006 | err = 0; |
3007 | goto exit; | |
44a5e5eb DG |
3008 | } |
3009 | ||
3010 | /* Event on the registration socket */ | |
3011 | if (pollfd == sock) { | |
3012 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3013 | ERR("Health socket poll error"); | |
3014 | goto error; | |
3015 | } | |
3016 | } | |
3017 | } | |
3018 | ||
3019 | new_sock = lttcomm_accept_unix_sock(sock); | |
3020 | if (new_sock < 0) { | |
3021 | goto error; | |
3022 | } | |
3023 | ||
b662582b DG |
3024 | /* |
3025 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3026 | * show must go on. | |
3027 | */ | |
3028 | (void) utils_set_fd_cloexec(new_sock); | |
3029 | ||
44a5e5eb DG |
3030 | DBG("Receiving data from client for health..."); |
3031 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3032 | if (ret <= 0) { | |
3033 | DBG("Nothing recv() from client... continuing"); | |
3034 | ret = close(new_sock); | |
3035 | if (ret) { | |
3036 | PERROR("close"); | |
3037 | } | |
3038 | new_sock = -1; | |
3039 | continue; | |
3040 | } | |
3041 | ||
3042 | rcu_thread_online(); | |
3043 | ||
3044 | switch (msg.component) { | |
3045 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3046 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3047 | break; |
139ac872 | 3048 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3049 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3050 | break; |
44a5e5eb | 3051 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3052 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3053 | break; |
3054 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3055 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3056 | break; |
3057 | case LTTNG_HEALTH_CONSUMER: | |
3058 | reply.ret_code = check_consumer_health(); | |
3059 | break; | |
3060 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3061 | reply.ret_code = |
927ca06a DG |
3062 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3063 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3064 | health_check_state(HEALTH_TYPE_CMD) && | |
3065 | health_check_state(HEALTH_TYPE_KERNEL) && | |
139ac872 | 3066 | check_consumer_health(); |
44a5e5eb DG |
3067 | break; |
3068 | default: | |
f73fabfd | 3069 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3070 | break; |
3071 | } | |
3072 | ||
3073 | /* | |
3074 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3075 | * the client where in the sessiond it is the opposite. Again, this is | |
3076 | * just to make things easier for us poor developer which enjoy a lot | |
3077 | * lazyness. | |
3078 | */ | |
3079 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3080 | reply.ret_code = !reply.ret_code; | |
3081 | } | |
3082 | ||
3083 | DBG2("Health check return value %d", reply.ret_code); | |
3084 | ||
3085 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3086 | if (ret < 0) { | |
3087 | ERR("Failed to send health data back to client"); | |
3088 | } | |
3089 | ||
3090 | /* End of transmission */ | |
3091 | ret = close(new_sock); | |
3092 | if (ret) { | |
3093 | PERROR("close"); | |
3094 | } | |
3095 | new_sock = -1; | |
3096 | } | |
3097 | ||
139ac872 | 3098 | exit: |
44a5e5eb | 3099 | error: |
139ac872 MD |
3100 | if (err) { |
3101 | ERR("Health error occurred in %s", __func__); | |
3102 | } | |
44a5e5eb DG |
3103 | DBG("Health check thread dying"); |
3104 | unlink(health_unix_sock_path); | |
3105 | if (sock >= 0) { | |
3106 | ret = close(sock); | |
3107 | if (ret) { | |
3108 | PERROR("close"); | |
3109 | } | |
3110 | } | |
3111 | if (new_sock >= 0) { | |
3112 | ret = close(new_sock); | |
3113 | if (ret) { | |
3114 | PERROR("close"); | |
3115 | } | |
3116 | } | |
3117 | ||
3118 | lttng_poll_clean(&events); | |
3119 | ||
3120 | rcu_unregister_thread(); | |
3121 | return NULL; | |
3122 | } | |
3123 | ||
1d4b027a | 3124 | /* |
d063d709 DG |
3125 | * This thread manage all clients request using the unix client socket for |
3126 | * communication. | |
1d4b027a DG |
3127 | */ |
3128 | static void *thread_manage_clients(void *data) | |
3129 | { | |
139ac872 | 3130 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3131 | int sock_error; |
5eb91c98 | 3132 | uint32_t revents, nb_fd; |
273ea72c | 3133 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3134 | struct lttng_poll_event events; |
1d4b027a DG |
3135 | |
3136 | DBG("[thread] Manage client started"); | |
3137 | ||
f6a9efaa DG |
3138 | rcu_register_thread(); |
3139 | ||
927ca06a DG |
3140 | health_register(HEALTH_TYPE_CMD); |
3141 | ||
6993eeb3 CB |
3142 | if (testpoint(thread_manage_clients)) { |
3143 | goto error_testpoint; | |
3144 | } | |
3145 | ||
840cb59c | 3146 | health_code_update(); |
44a5e5eb | 3147 | |
1d4b027a DG |
3148 | ret = lttcomm_listen_unix_sock(client_sock); |
3149 | if (ret < 0) { | |
35df2755 | 3150 | goto error_listen; |
1d4b027a DG |
3151 | } |
3152 | ||
5eb91c98 DG |
3153 | /* |
3154 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3155 | * more will be added to this poll set. | |
3156 | */ | |
3157 | ret = create_thread_poll_set(&events, 2); | |
3158 | if (ret < 0) { | |
35df2755 | 3159 | goto error_create_poll; |
5eb91c98 | 3160 | } |
273ea72c | 3161 | |
5eb91c98 DG |
3162 | /* Add the application registration socket */ |
3163 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3164 | if (ret < 0) { | |
3165 | goto error; | |
3166 | } | |
273ea72c | 3167 | |
bbd973c2 DG |
3168 | /* |
3169 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3170 | */ |
3171 | if (opt_sig_parent) { | |
8db8d1dc | 3172 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3173 | } |
3174 | ||
6993eeb3 CB |
3175 | if (testpoint(thread_manage_clients_before_loop)) { |
3176 | goto error; | |
3177 | } | |
8ac94142 | 3178 | |
840cb59c | 3179 | health_code_update(); |
44a5e5eb | 3180 | |
1d4b027a | 3181 | while (1) { |
1d4b027a | 3182 | DBG("Accepting client command ..."); |
273ea72c DG |
3183 | |
3184 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3185 | restart: |
a78af745 | 3186 | health_poll_entry(); |
5eb91c98 | 3187 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3188 | health_poll_exit(); |
273ea72c | 3189 | if (ret < 0) { |
88f2b785 MD |
3190 | /* |
3191 | * Restart interrupted system call. | |
3192 | */ | |
3193 | if (errno == EINTR) { | |
3194 | goto restart; | |
3195 | } | |
273ea72c DG |
3196 | goto error; |
3197 | } | |
3198 | ||
0d9c5d77 DG |
3199 | nb_fd = ret; |
3200 | ||
5eb91c98 DG |
3201 | for (i = 0; i < nb_fd; i++) { |
3202 | /* Fetch once the poll data */ | |
3203 | revents = LTTNG_POLL_GETEV(&events, i); | |
3204 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3205 | ||
840cb59c | 3206 | health_code_update(); |
44a5e5eb | 3207 | |
5eb91c98 DG |
3208 | /* Thread quit pipe has been closed. Killing thread. */ |
3209 | ret = check_thread_quit_pipe(pollfd, revents); | |
3210 | if (ret) { | |
139ac872 MD |
3211 | err = 0; |
3212 | goto exit; | |
5eb91c98 DG |
3213 | } |
3214 | ||
3215 | /* Event on the registration socket */ | |
3216 | if (pollfd == client_sock) { | |
3217 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3218 | ERR("Client socket poll error"); | |
3219 | goto error; | |
3220 | } | |
3221 | } | |
3222 | } | |
3223 | ||
3224 | DBG("Wait for client response"); | |
3225 | ||
840cb59c | 3226 | health_code_update(); |
44a5e5eb | 3227 | |
5eb91c98 DG |
3228 | sock = lttcomm_accept_unix_sock(client_sock); |
3229 | if (sock < 0) { | |
273ea72c | 3230 | goto error; |
273ea72c DG |
3231 | } |
3232 | ||
b662582b DG |
3233 | /* |
3234 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3235 | * show must go on. | |
3236 | */ | |
3237 | (void) utils_set_fd_cloexec(sock); | |
3238 | ||
be040666 DG |
3239 | /* Set socket option for credentials retrieval */ |
3240 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3241 | if (ret < 0) { | |
3242 | goto error; | |
3243 | } | |
3244 | ||
5eb91c98 | 3245 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3246 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3247 | if (cmd_ctx == NULL) { |
76d7553f | 3248 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3249 | goto error; |
5eb91c98 | 3250 | } |
1d4b027a | 3251 | |
5eb91c98 | 3252 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3253 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3254 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3255 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3256 | goto error; |
3257 | } | |
1d4b027a | 3258 | |
5eb91c98 DG |
3259 | cmd_ctx->llm = NULL; |
3260 | cmd_ctx->session = NULL; | |
1d4b027a | 3261 | |
840cb59c | 3262 | health_code_update(); |
44a5e5eb | 3263 | |
5eb91c98 DG |
3264 | /* |
3265 | * Data is received from the lttng client. The struct | |
3266 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3267 | * the client. | |
3268 | */ | |
3269 | DBG("Receiving data from client ..."); | |
be040666 DG |
3270 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3271 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3272 | if (ret <= 0) { |
3273 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3274 | ret = close(sock); |
3275 | if (ret) { | |
3276 | PERROR("close"); | |
3277 | } | |
3278 | sock = -1; | |
a2c0da86 | 3279 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3280 | continue; |
3281 | } | |
1d4b027a | 3282 | |
840cb59c | 3283 | health_code_update(); |
44a5e5eb | 3284 | |
5eb91c98 DG |
3285 | // TODO: Validate cmd_ctx including sanity check for |
3286 | // security purpose. | |
f7776ea7 | 3287 | |
f6a9efaa | 3288 | rcu_thread_online(); |
5eb91c98 DG |
3289 | /* |
3290 | * This function dispatch the work to the kernel or userspace tracer | |
3291 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3292 | * informations for the client. The command context struct contains | |
3293 | * everything this function may needs. | |
3294 | */ | |
53a80697 | 3295 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3296 | rcu_thread_offline(); |
5eb91c98 | 3297 | if (ret < 0) { |
53a80697 MD |
3298 | if (sock_error) { |
3299 | ret = close(sock); | |
3300 | if (ret) { | |
3301 | PERROR("close"); | |
3302 | } | |
3303 | sock = -1; | |
3304 | } | |
bbd973c2 | 3305 | /* |
5eb91c98 | 3306 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3307 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3308 | * (ENOMEM). Error detected but still accept |
3309 | * command, unless a socket error has been | |
3310 | * detected. | |
bbd973c2 | 3311 | */ |
bbd973c2 | 3312 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3313 | continue; |
3314 | } | |
d6e4fca4 | 3315 | |
840cb59c | 3316 | health_code_update(); |
44a5e5eb | 3317 | |
54d01ffb DG |
3318 | DBG("Sending response (size: %d, retcode: %s)", |
3319 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3320 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3321 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3322 | if (ret < 0) { |
3323 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3324 | } |
1d4b027a | 3325 | |
5eb91c98 | 3326 | /* End of transmission */ |
76d7553f MD |
3327 | ret = close(sock); |
3328 | if (ret) { | |
3329 | PERROR("close"); | |
3330 | } | |
3331 | sock = -1; | |
be040666 DG |
3332 | |
3333 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3334 | |
840cb59c | 3335 | health_code_update(); |
273ea72c DG |
3336 | } |
3337 | ||
139ac872 | 3338 | exit: |
5eb91c98 | 3339 | error: |
35df2755 CB |
3340 | if (sock >= 0) { |
3341 | ret = close(sock); | |
3342 | if (ret) { | |
3343 | PERROR("close"); | |
3344 | } | |
139ac872 | 3345 | } |
44a5e5eb | 3346 | |
35df2755 CB |
3347 | lttng_poll_clean(&events); |
3348 | clean_command_ctx(&cmd_ctx); | |
3349 | ||
3350 | error_listen: | |
3351 | error_create_poll: | |
6993eeb3 | 3352 | error_testpoint: |
273ea72c | 3353 | unlink(client_unix_sock_path); |
76d7553f MD |
3354 | if (client_sock >= 0) { |
3355 | ret = close(client_sock); | |
3356 | if (ret) { | |
3357 | PERROR("close"); | |
3358 | } | |
a4b35e07 | 3359 | } |
35df2755 CB |
3360 | |
3361 | if (err) { | |
840cb59c | 3362 | health_error(); |
35df2755 | 3363 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3364 | } |
273ea72c | 3365 | |
927ca06a | 3366 | health_unregister(); |
35df2755 CB |
3367 | |
3368 | DBG("Client thread dying"); | |
f6a9efaa DG |
3369 | |
3370 | rcu_unregister_thread(); | |
1d4b027a DG |
3371 | return NULL; |
3372 | } | |
3373 | ||
3374 | ||
fac6795d DG |
3375 | /* |
3376 | * usage function on stderr | |
3377 | */ | |
3378 | static void usage(void) | |
3379 | { | |
b716ce68 | 3380 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3381 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3382 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3383 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3384 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3385 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3386 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3387 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3388 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3389 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3390 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3391 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3392 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3393 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3394 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3395 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3396 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3397 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3398 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3399 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3400 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3401 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3402 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3403 | } |
3404 | ||
3405 | /* | |
3406 | * daemon argument parsing | |
3407 | */ | |
3408 | static int parse_args(int argc, char **argv) | |
3409 | { | |
3410 | int c; | |
3411 | ||
3412 | static struct option long_options[] = { | |
3413 | { "client-sock", 1, 0, 'c' }, | |
3414 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3415 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3416 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3417 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3418 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3419 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3420 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3421 | { "consumerd32-path", 1, 0, 'u' }, | |
3422 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3423 | { "consumerd64-path", 1, 0, 't' }, | |
3424 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3425 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3426 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3427 | { "help", 0, 0, 'h' }, |
3428 | { "group", 1, 0, 'g' }, | |
3429 | { "version", 0, 0, 'V' }, | |
75462a81 | 3430 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3431 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3432 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3433 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3434 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3435 | { NULL, 0, 0, 0 } |
3436 | }; | |
3437 | ||
3438 | while (1) { | |
3439 | int option_index = 0; | |
35f90c40 | 3440 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3441 | long_options, &option_index); |
fac6795d DG |
3442 | if (c == -1) { |
3443 | break; | |
3444 | } | |
3445 | ||
3446 | switch (c) { | |
3447 | case 0: | |
3448 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3449 | if (optarg) { | |
3450 | fprintf(stderr, " with arg %s\n", optarg); | |
3451 | } | |
3452 | break; | |
b716ce68 | 3453 | case 'c': |
fac6795d DG |
3454 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3455 | break; | |
3456 | case 'a': | |
3457 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3458 | break; | |
3459 | case 'd': | |
3460 | opt_daemon = 1; | |
3461 | break; | |
3462 | case 'g': | |
fb09408a | 3463 | opt_tracing_group = optarg; |
fac6795d DG |
3464 | break; |
3465 | case 'h': | |
3466 | usage(); | |
3467 | exit(EXIT_FAILURE); | |
3468 | case 'V': | |
3469 | fprintf(stdout, "%s\n", VERSION); | |
3470 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3471 | case 'S': |
3472 | opt_sig_parent = 1; | |
3473 | break; | |
d6f42150 | 3474 | case 'E': |
3bd1e081 | 3475 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3476 | break; |
3477 | case 'C': | |
3bd1e081 MD |
3478 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3479 | break; | |
3480 | case 'F': | |
7753dea8 | 3481 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3482 | break; |
3483 | case 'D': | |
7753dea8 MD |
3484 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3485 | break; | |
3486 | case 'H': | |
3487 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3488 | break; | |
3489 | case 'G': | |
3490 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3491 | break; |
4fba7219 DG |
3492 | case 'N': |
3493 | opt_no_kernel = 1; | |
3494 | break; | |
75462a81 | 3495 | case 'q': |
97e19046 | 3496 | lttng_opt_quiet = 1; |
75462a81 | 3497 | break; |
3f9947db | 3498 | case 'v': |
53086306 | 3499 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3500 | lttng_opt_verbose += 1; |
3f9947db | 3501 | break; |
31f73cc9 | 3502 | case 'Z': |
3bd1e081 | 3503 | opt_verbose_consumer += 1; |
31f73cc9 | 3504 | break; |
fb09408a | 3505 | case 'u': |
fc7a59ce | 3506 | consumerd32_bin= optarg; |
ebaeda94 MD |
3507 | break; |
3508 | case 'U': | |
3509 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3510 | break; |
3511 | case 't': | |
fc7a59ce | 3512 | consumerd64_bin = optarg; |
ebaeda94 MD |
3513 | break; |
3514 | case 'T': | |
3515 | consumerd64_libdir = optarg; | |
fb09408a | 3516 | break; |
35f90c40 DG |
3517 | case 'p': |
3518 | opt_pidfile = optarg; | |
3519 | break; | |
fac6795d DG |
3520 | default: |
3521 | /* Unknown option or other error. | |
3522 | * Error is printed by getopt, just return */ | |
3523 | return -1; | |
3524 | } | |
3525 | } | |
3526 | ||
3527 | return 0; | |
3528 | } | |
3529 | ||
3530 | /* | |
d063d709 | 3531 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3532 | * apps_sock - The communication socket for all UST apps. |
3533 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3534 | */ |
cf3af59e | 3535 | static int init_daemon_socket(void) |
fac6795d DG |
3536 | { |
3537 | int ret = 0; | |
3538 | mode_t old_umask; | |
3539 | ||
3540 | old_umask = umask(0); | |
3541 | ||
3542 | /* Create client tool unix socket */ | |
d6f42150 DG |
3543 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3544 | if (client_sock < 0) { | |
3545 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3546 | ret = -1; |
3547 | goto end; | |
3548 | } | |
3549 | ||
b662582b DG |
3550 | /* Set the cloexec flag */ |
3551 | ret = utils_set_fd_cloexec(client_sock); | |
3552 | if (ret < 0) { | |
3553 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3554 | "Continuing but note that the consumer daemon will have a " | |
3555 | "reference to this socket on exec()", client_sock); | |
3556 | } | |
3557 | ||
fac6795d DG |
3558 | /* File permission MUST be 660 */ |
3559 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3560 | if (ret < 0) { | |
d6f42150 | 3561 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3562 | PERROR("chmod"); |
fac6795d DG |
3563 | goto end; |
3564 | } | |
3565 | ||
3566 | /* Create the application unix socket */ | |
d6f42150 DG |
3567 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3568 | if (apps_sock < 0) { | |
3569 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3570 | ret = -1; |
3571 | goto end; | |
3572 | } | |
3573 | ||
b662582b DG |
3574 | /* Set the cloexec flag */ |
3575 | ret = utils_set_fd_cloexec(apps_sock); | |
3576 | if (ret < 0) { | |
3577 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3578 | "Continuing but note that the consumer daemon will have a " | |
3579 | "reference to this socket on exec()", apps_sock); | |
3580 | } | |
3581 | ||
d6f42150 | 3582 | /* File permission MUST be 666 */ |
54d01ffb DG |
3583 | ret = chmod(apps_unix_sock_path, |
3584 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3585 | if (ret < 0) { |
d6f42150 | 3586 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3587 | PERROR("chmod"); |
fac6795d DG |
3588 | goto end; |
3589 | } | |
3590 | ||
b662582b DG |
3591 | DBG3("Session daemon client socket %d and application socket %d created", |
3592 | client_sock, apps_sock); | |
3593 | ||
fac6795d DG |
3594 | end: |
3595 | umask(old_umask); | |
3596 | return ret; | |
3597 | } | |
3598 | ||
3599 | /* | |
54d01ffb DG |
3600 | * Check if the global socket is available, and if a daemon is answering at the |
3601 | * other side. If yes, error is returned. | |
fac6795d | 3602 | */ |
cf3af59e | 3603 | static int check_existing_daemon(void) |
fac6795d | 3604 | { |
7d8234d9 | 3605 | /* Is there anybody out there ? */ |
099e26bd | 3606 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3607 | return -EEXIST; |
099e26bd | 3608 | } |
b09c7c76 DG |
3609 | |
3610 | return 0; | |
fac6795d DG |
3611 | } |
3612 | ||
fac6795d | 3613 | /* |
d063d709 | 3614 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3615 | * |
d063d709 | 3616 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3617 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3618 | */ |
be040666 | 3619 | static int set_permissions(char *rundir) |
fac6795d DG |
3620 | { |
3621 | int ret; | |
996b65c8 | 3622 | gid_t gid; |
fac6795d | 3623 | |
6775595e DG |
3624 | ret = allowed_group(); |
3625 | if (ret < 0) { | |
be040666 DG |
3626 | WARN("No tracing group detected"); |
3627 | ret = 0; | |
fac6795d DG |
3628 | goto end; |
3629 | } | |
3630 | ||
6775595e DG |
3631 | gid = ret; |
3632 | ||
d6f42150 | 3633 | /* Set lttng run dir */ |
be040666 | 3634 | ret = chown(rundir, 0, gid); |
d6f42150 | 3635 | if (ret < 0) { |
be040666 | 3636 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3637 | PERROR("chown"); |
d6f42150 DG |
3638 | } |
3639 | ||
d1613cf5 | 3640 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3641 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3642 | if (ret < 0) { |
3643 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3644 | PERROR("chmod"); |
d1613cf5 JN |
3645 | } |
3646 | ||
d6f42150 | 3647 | /* lttng client socket path */ |
996b65c8 | 3648 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3649 | if (ret < 0) { |
d6f42150 | 3650 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3651 | PERROR("chown"); |
d6f42150 DG |
3652 | } |
3653 | ||
3bd1e081 MD |
3654 | /* kconsumer error socket path */ |
3655 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3656 | if (ret < 0) { |
3bd1e081 | 3657 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3658 | PERROR("chown"); |
3bd1e081 MD |
3659 | } |
3660 | ||
7753dea8 MD |
3661 | /* 64-bit ustconsumer error socket path */ |
3662 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3663 | if (ret < 0) { | |
3664 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3665 | PERROR("chown"); |
7753dea8 MD |
3666 | } |
3667 | ||
3668 | /* 32-bit ustconsumer compat32 error socket path */ | |
3669 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3670 | if (ret < 0) { |
7753dea8 | 3671 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3672 | PERROR("chown"); |
fac6795d DG |
3673 | } |
3674 | ||
d6f42150 | 3675 | DBG("All permissions are set"); |
e07ae692 | 3676 | |
fac6795d DG |
3677 | end: |
3678 | return ret; | |
3679 | } | |
3680 | ||
d6f42150 | 3681 | /* |
d063d709 | 3682 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3683 | */ |
67e40797 | 3684 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3685 | { |
3686 | int ret; | |
3687 | ||
67e40797 DG |
3688 | DBG3("Creating LTTng run directory: %s", rundir); |
3689 | ||
d1613cf5 | 3690 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3691 | if (ret < 0) { |
b1f11e69 | 3692 | if (errno != EEXIST) { |
67e40797 | 3693 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3694 | goto error; |
3695 | } else { | |
3696 | ret = 0; | |
3697 | } | |
d6f42150 DG |
3698 | } |
3699 | ||
3700 | error: | |
3701 | return ret; | |
3702 | } | |
3703 | ||
3704 | /* | |
d063d709 DG |
3705 | * Setup sockets and directory needed by the kconsumerd communication with the |
3706 | * session daemon. | |
d6f42150 | 3707 | */ |
67e40797 DG |
3708 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3709 | const char *rundir) | |
d6f42150 DG |
3710 | { |
3711 | int ret; | |
67e40797 | 3712 | char path[PATH_MAX]; |
d6f42150 | 3713 | |
67e40797 | 3714 | switch (consumer_data->type) { |
7753dea8 | 3715 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3716 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3717 | break; |
3718 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3719 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3720 | break; |
3721 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3722 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3723 | break; |
3724 | default: | |
3725 | ERR("Consumer type unknown"); | |
3726 | ret = -EINVAL; | |
3727 | goto error; | |
d6f42150 DG |
3728 | } |
3729 | ||
67e40797 DG |
3730 | DBG2("Creating consumer directory: %s", path); |
3731 | ||
d1613cf5 | 3732 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3733 | if (ret < 0) { |
6beb2242 | 3734 | if (errno != EEXIST) { |
f11e84c2 | 3735 | PERROR("mkdir"); |
3bd1e081 | 3736 | ERR("Failed to create %s", path); |
6beb2242 DG |
3737 | goto error; |
3738 | } | |
f11e84c2 | 3739 | ret = -1; |
d6f42150 DG |
3740 | } |
3741 | ||
3742 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3743 | consumer_data->err_sock = |
3744 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3745 | if (consumer_data->err_sock < 0) { | |
3746 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3747 | ret = -1; |
3748 | goto error; | |
3749 | } | |
3750 | ||
3751 | /* File permission MUST be 660 */ | |
3bd1e081 | 3752 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3753 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3754 | if (ret < 0) { |
3bd1e081 | 3755 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3756 | PERROR("chmod"); |
d6f42150 DG |
3757 | goto error; |
3758 | } | |
3759 | ||
3760 | error: | |
3761 | return ret; | |
3762 | } | |
3763 | ||
fac6795d | 3764 | /* |
d063d709 | 3765 | * Signal handler for the daemon |
cf3af59e | 3766 | * |
54d01ffb DG |
3767 | * Simply stop all worker threads, leaving main() return gracefully after |
3768 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3769 | */ |
3770 | static void sighandler(int sig) | |
3771 | { | |
3772 | switch (sig) { | |
cf3af59e | 3773 | case SIGPIPE: |
af87c45a | 3774 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3775 | return; |
3776 | case SIGINT: | |
af87c45a | 3777 | DBG("SIGINT caught"); |
cf3af59e MD |
3778 | stop_threads(); |
3779 | break; | |
3780 | case SIGTERM: | |
af87c45a | 3781 | DBG("SIGTERM caught"); |
cf3af59e MD |
3782 | stop_threads(); |
3783 | break; | |
3784 | default: | |
3785 | break; | |
fac6795d | 3786 | } |
fac6795d DG |
3787 | } |
3788 | ||
3789 | /* | |
d063d709 | 3790 | * Setup signal handler for : |
1d4b027a | 3791 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3792 | */ |
1d4b027a | 3793 | static int set_signal_handler(void) |
fac6795d | 3794 | { |
1d4b027a DG |
3795 | int ret = 0; |
3796 | struct sigaction sa; | |
3797 | sigset_t sigset; | |
fac6795d | 3798 | |
1d4b027a | 3799 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3800 | PERROR("sigemptyset"); |
1d4b027a DG |
3801 | return ret; |
3802 | } | |
d6f42150 | 3803 | |
1d4b027a DG |
3804 | sa.sa_handler = sighandler; |
3805 | sa.sa_mask = sigset; | |
3806 | sa.sa_flags = 0; | |
3807 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3808 | PERROR("sigaction"); |
1d4b027a | 3809 | return ret; |
d6f42150 DG |
3810 | } |
3811 | ||
1d4b027a | 3812 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3813 | PERROR("sigaction"); |
1d4b027a | 3814 | return ret; |
d6f42150 | 3815 | } |
aaf26714 | 3816 | |
1d4b027a | 3817 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3818 | PERROR("sigaction"); |
1d4b027a | 3819 | return ret; |
8c0faa1d DG |
3820 | } |
3821 | ||
1d4b027a DG |
3822 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3823 | ||
3824 | return ret; | |
fac6795d DG |
3825 | } |
3826 | ||
f3ed775e | 3827 | /* |
d063d709 DG |
3828 | * Set open files limit to unlimited. This daemon can open a large number of |
3829 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3830 | */ |
3831 | static void set_ulimit(void) | |
3832 | { | |
3833 | int ret; | |
3834 | struct rlimit lim; | |
3835 | ||
a88df331 | 3836 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3837 | lim.rlim_cur = 65535; |
3838 | lim.rlim_max = 65535; | |
3839 | ||
3840 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3841 | if (ret < 0) { | |
76d7553f | 3842 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3843 | } |
3844 | } | |
3845 | ||
35f90c40 DG |
3846 | /* |
3847 | * Write pidfile using the rundir and opt_pidfile. | |
3848 | */ | |
3849 | static void write_pidfile(void) | |
3850 | { | |
3851 | int ret; | |
3852 | char pidfile_path[PATH_MAX]; | |
3853 | ||
3854 | assert(rundir); | |
3855 | ||
3856 | if (opt_pidfile) { | |
3857 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
3858 | } else { | |
3859 | /* Build pidfile path from rundir and opt_pidfile. */ | |
3860 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
3861 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
3862 | if (ret < 0) { | |
3863 | PERROR("snprintf pidfile path"); | |
3864 | goto error; | |
3865 | } | |
3866 | } | |
3867 | ||
3868 | /* | |
3869 | * Create pid file in rundir. Return value is of no importance. The | |
3870 | * execution will continue even though we are not able to write the file. | |
3871 | */ | |
3872 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
3873 | ||
3874 | error: | |
3875 | return; | |
3876 | } | |
3877 | ||
fac6795d DG |
3878 | /* |
3879 | * main | |
3880 | */ | |
3881 | int main(int argc, char **argv) | |
3882 | { | |
fac6795d DG |
3883 | int ret = 0; |
3884 | void *status; | |
ae9e45b3 | 3885 | const char *home_path, *env_app_timeout; |
fac6795d | 3886 | |
335a95b7 MD |
3887 | init_kernel_workarounds(); |
3888 | ||
f6a9efaa DG |
3889 | rcu_register_thread(); |
3890 | ||
7753dea8 | 3891 | setup_consumerd_path(); |
fb09408a | 3892 | |
fac6795d DG |
3893 | /* Parse arguments */ |
3894 | progname = argv[0]; | |
c617c0c6 | 3895 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 3896 | goto error; |
fac6795d DG |
3897 | } |
3898 | ||
3899 | /* Daemonize */ | |
3900 | if (opt_daemon) { | |
ceed52b5 MD |
3901 | int i; |
3902 | ||
3903 | /* | |
3904 | * fork | |
3905 | * child: setsid, close FD 0, 1, 2, chdir / | |
3906 | * parent: exit (if fork is successful) | |
3907 | */ | |
53094c05 DG |
3908 | ret = daemon(0, 0); |
3909 | if (ret < 0) { | |
76d7553f | 3910 | PERROR("daemon"); |
cf3af59e | 3911 | goto error; |
53094c05 | 3912 | } |
ceed52b5 MD |
3913 | /* |
3914 | * We are in the child. Make sure all other file | |
3915 | * descriptors are closed, in case we are called with | |
3916 | * more opened file descriptors than the standard ones. | |
3917 | */ | |
3918 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3919 | (void) close(i); | |
3920 | } | |
3921 | } | |
3922 | ||
3923 | /* Create thread quit pipe */ | |
3924 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3925 | goto error; | |
fac6795d DG |
3926 | } |
3927 | ||
3928 | /* Check if daemon is UID = 0 */ | |
3929 | is_root = !getuid(); | |
3930 | ||
fac6795d | 3931 | if (is_root) { |
990570ed | 3932 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3933 | |
3934 | /* Create global run dir with root access */ | |
3935 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3936 | if (ret < 0) { |
cf3af59e | 3937 | goto error; |
d6f42150 DG |
3938 | } |
3939 | ||
fac6795d | 3940 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3941 | snprintf(apps_unix_sock_path, PATH_MAX, |
3942 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3943 | } |
3944 | ||
3945 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3946 | snprintf(client_unix_sock_path, PATH_MAX, |
3947 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3948 | } | |
0fdd1e2c DG |
3949 | |
3950 | /* Set global SHM for ust */ | |
3951 | if (strlen(wait_shm_path) == 0) { | |
3952 | snprintf(wait_shm_path, PATH_MAX, | |
3953 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3954 | } | |
67e40797 | 3955 | |
44a5e5eb DG |
3956 | if (strlen(health_unix_sock_path) == 0) { |
3957 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3958 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3959 | } | |
3960 | ||
67e40797 DG |
3961 | /* Setup kernel consumerd path */ |
3962 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3963 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3964 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3965 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3966 | |
3967 | DBG2("Kernel consumer err path: %s", | |
3968 | kconsumer_data.err_unix_sock_path); | |
3969 | DBG2("Kernel consumer cmd path: %s", | |
3970 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 3971 | } else { |
b082db07 DG |
3972 | home_path = get_home_dir(); |
3973 | if (home_path == NULL) { | |
273ea72c DG |
3974 | /* TODO: Add --socket PATH option */ |
3975 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3976 | ret = -EPERM; |
3977 | goto error; | |
b082db07 DG |
3978 | } |
3979 | ||
67e40797 DG |
3980 | /* |
3981 | * Create rundir from home path. This will create something like | |
3982 | * $HOME/.lttng | |
3983 | */ | |
990570ed | 3984 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
3985 | if (ret < 0) { |
3986 | ret = -ENOMEM; | |
3987 | goto error; | |
3988 | } | |
3989 | ||
3990 | ret = create_lttng_rundir(rundir); | |
3991 | if (ret < 0) { | |
3992 | goto error; | |
3993 | } | |
3994 | ||
fac6795d | 3995 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3996 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3997 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3998 | } |
3999 | ||
4000 | /* Set the cli tool unix socket path */ | |
4001 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4002 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4003 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4004 | } |
0fdd1e2c DG |
4005 | |
4006 | /* Set global SHM for ust */ | |
4007 | if (strlen(wait_shm_path) == 0) { | |
4008 | snprintf(wait_shm_path, PATH_MAX, | |
4009 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4010 | } | |
44a5e5eb DG |
4011 | |
4012 | /* Set health check Unix path */ | |
4013 | if (strlen(health_unix_sock_path) == 0) { | |
4014 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4015 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4016 | } | |
fac6795d DG |
4017 | } |
4018 | ||
5c827ce0 DG |
4019 | /* Set consumer initial state */ |
4020 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4021 | ust_consumerd_state = CONSUMER_STOPPED; | |
4022 | ||
847177cd DG |
4023 | DBG("Client socket path %s", client_unix_sock_path); |
4024 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4025 | DBG("LTTng run directory path: %s", rundir); |
4026 | ||
4027 | /* 32 bits consumerd path setup */ | |
4028 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4029 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4030 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4031 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4032 | |
4033 | DBG2("UST consumer 32 bits err path: %s", | |
4034 | ustconsumer32_data.err_unix_sock_path); | |
4035 | DBG2("UST consumer 32 bits cmd path: %s", | |
4036 | ustconsumer32_data.cmd_unix_sock_path); | |
4037 | ||
4038 | /* 64 bits consumerd path setup */ | |
4039 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4040 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4041 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4042 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4043 | |
4044 | DBG2("UST consumer 64 bits err path: %s", | |
4045 | ustconsumer64_data.err_unix_sock_path); | |
4046 | DBG2("UST consumer 64 bits cmd path: %s", | |
4047 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4048 | |
273ea72c | 4049 | /* |
7d8234d9 | 4050 | * See if daemon already exist. |
fac6795d | 4051 | */ |
7d8234d9 | 4052 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4053 | ERR("Already running daemon.\n"); |
273ea72c | 4054 | /* |
cf3af59e MD |
4055 | * We do not goto exit because we must not cleanup() |
4056 | * because a daemon is already running. | |
ab118b20 | 4057 | */ |
cf3af59e | 4058 | goto error; |
a88df331 DG |
4059 | } |
4060 | ||
1427f9b2 DG |
4061 | /* |
4062 | * Init UST app hash table. Alloc hash table before this point since | |
4063 | * cleanup() can get called after that point. | |
4064 | */ | |
4065 | ust_app_ht_alloc(); | |
4066 | ||
54d01ffb | 4067 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4068 | |
4069 | /* | |
4070 | * These actions must be executed as root. We do that *after* setting up | |
4071 | * the sockets path because we MUST make the check for another daemon using | |
4072 | * those paths *before* trying to set the kernel consumer sockets and init | |
4073 | * kernel tracer. | |
4074 | */ | |
4075 | if (is_root) { | |
67e40797 | 4076 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4077 | if (ret < 0) { |
4078 | goto exit; | |
4079 | } | |
4080 | ||
a88df331 | 4081 | /* Setup kernel tracer */ |
4fba7219 DG |
4082 | if (!opt_no_kernel) { |
4083 | init_kernel_tracer(); | |
4084 | } | |
a88df331 DG |
4085 | |
4086 | /* Set ulimit for open files */ | |
4087 | set_ulimit(); | |
fac6795d | 4088 | } |
4063050c MD |
4089 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4090 | lttng_fd_init(); | |
fac6795d | 4091 | |
67e40797 DG |
4092 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4093 | if (ret < 0) { | |
4094 | goto exit; | |
4095 | } | |
4096 | ||
4097 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4098 | if (ret < 0) { | |
4099 | goto exit; | |
4100 | } | |
4101 | ||
cf3af59e MD |
4102 | if ((ret = set_signal_handler()) < 0) { |
4103 | goto exit; | |
fac6795d DG |
4104 | } |
4105 | ||
d6f42150 | 4106 | /* Setup the needed unix socket */ |
cf3af59e MD |
4107 | if ((ret = init_daemon_socket()) < 0) { |
4108 | goto exit; | |
fac6795d DG |
4109 | } |
4110 | ||
4111 | /* Set credentials to socket */ | |
be040666 | 4112 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4113 | goto exit; |
fac6795d DG |
4114 | } |
4115 | ||
5b8719f5 DG |
4116 | /* Get parent pid if -S, --sig-parent is specified. */ |
4117 | if (opt_sig_parent) { | |
4118 | ppid = getppid(); | |
4119 | } | |
4120 | ||
7a485870 | 4121 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4122 | if (is_root && !opt_no_kernel) { |
4123 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4124 | goto exit; | |
4125 | } | |
7a485870 DG |
4126 | } |
4127 | ||
099e26bd | 4128 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4129 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4130 | goto exit; |
4131 | } | |
4132 | ||
4133 | /* Init UST command queue. */ | |
4134 | cds_wfq_init(&ust_cmd_queue.queue); | |
4135 | ||
273ea72c | 4136 | /* |
54d01ffb DG |
4137 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4138 | * statically declared in session.c | |
273ea72c | 4139 | */ |
54d01ffb | 4140 | session_list_ptr = session_get_list(); |
b5541356 | 4141 | |
5eb91c98 DG |
4142 | /* Set up max poll set size */ |
4143 | lttng_poll_set_max_size(); | |
4144 | ||
2f77fc4b | 4145 | cmd_init(); |
00e2e675 | 4146 | |
ae9e45b3 DG |
4147 | /* Check for the application socket timeout env variable. */ |
4148 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4149 | if (env_app_timeout) { | |
4150 | app_socket_timeout = atoi(env_app_timeout); | |
4151 | } else { | |
4152 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4153 | } | |
4154 | ||
35f90c40 DG |
4155 | write_pidfile(); |
4156 | ||
44a5e5eb DG |
4157 | /* Create thread to manage the client socket */ |
4158 | ret = pthread_create(&health_thread, NULL, | |
4159 | thread_manage_health, (void *) NULL); | |
4160 | if (ret != 0) { | |
4161 | PERROR("pthread_create health"); | |
4162 | goto exit_health; | |
4163 | } | |
4164 | ||
cf3af59e | 4165 | /* Create thread to manage the client socket */ |
099e26bd DG |
4166 | ret = pthread_create(&client_thread, NULL, |
4167 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4168 | if (ret != 0) { |
76d7553f | 4169 | PERROR("pthread_create clients"); |
cf3af59e MD |
4170 | goto exit_client; |
4171 | } | |
fac6795d | 4172 | |
099e26bd DG |
4173 | /* Create thread to dispatch registration */ |
4174 | ret = pthread_create(&dispatch_thread, NULL, | |
4175 | thread_dispatch_ust_registration, (void *) NULL); | |
4176 | if (ret != 0) { | |
76d7553f | 4177 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4178 | goto exit_dispatch; |
4179 | } | |
4180 | ||
4181 | /* Create thread to manage application registration. */ | |
4182 | ret = pthread_create(®_apps_thread, NULL, | |
4183 | thread_registration_apps, (void *) NULL); | |
4184 | if (ret != 0) { | |
76d7553f | 4185 | PERROR("pthread_create registration"); |
099e26bd DG |
4186 | goto exit_reg_apps; |
4187 | } | |
4188 | ||
cf3af59e | 4189 | /* Create thread to manage application socket */ |
54d01ffb DG |
4190 | ret = pthread_create(&apps_thread, NULL, |
4191 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4192 | if (ret != 0) { |
76d7553f | 4193 | PERROR("pthread_create apps"); |
cf3af59e MD |
4194 | goto exit_apps; |
4195 | } | |
fac6795d | 4196 | |
6620da75 DG |
4197 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4198 | if (is_root && !opt_no_kernel) { | |
4199 | /* Create kernel thread to manage kernel event */ | |
4200 | ret = pthread_create(&kernel_thread, NULL, | |
4201 | thread_manage_kernel, (void *) NULL); | |
4202 | if (ret != 0) { | |
4203 | PERROR("pthread_create kernel"); | |
4204 | goto exit_kernel; | |
4205 | } | |
7a485870 | 4206 | |
6620da75 DG |
4207 | ret = pthread_join(kernel_thread, &status); |
4208 | if (ret != 0) { | |
4209 | PERROR("pthread_join"); | |
4210 | goto error; /* join error, exit without cleanup */ | |
4211 | } | |
fac6795d DG |
4212 | } |
4213 | ||
cf3af59e MD |
4214 | exit_kernel: |
4215 | ret = pthread_join(apps_thread, &status); | |
4216 | if (ret != 0) { | |
76d7553f | 4217 | PERROR("pthread_join"); |
cf3af59e MD |
4218 | goto error; /* join error, exit without cleanup */ |
4219 | } | |
fac6795d | 4220 | |
cf3af59e | 4221 | exit_apps: |
099e26bd DG |
4222 | ret = pthread_join(reg_apps_thread, &status); |
4223 | if (ret != 0) { | |
76d7553f | 4224 | PERROR("pthread_join"); |
099e26bd DG |
4225 | goto error; /* join error, exit without cleanup */ |
4226 | } | |
4227 | ||
4228 | exit_reg_apps: | |
4229 | ret = pthread_join(dispatch_thread, &status); | |
4230 | if (ret != 0) { | |
76d7553f | 4231 | PERROR("pthread_join"); |
099e26bd DG |
4232 | goto error; /* join error, exit without cleanup */ |
4233 | } | |
4234 | ||
4235 | exit_dispatch: | |
cf3af59e MD |
4236 | ret = pthread_join(client_thread, &status); |
4237 | if (ret != 0) { | |
76d7553f | 4238 | PERROR("pthread_join"); |
cf3af59e MD |
4239 | goto error; /* join error, exit without cleanup */ |
4240 | } | |
4241 | ||
3bd1e081 | 4242 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4243 | if (ret != 0) { |
76d7553f | 4244 | PERROR("join_consumer"); |
cf3af59e MD |
4245 | goto error; /* join error, exit without cleanup */ |
4246 | } | |
a88df331 | 4247 | |
06f525de DG |
4248 | ret = join_consumer_thread(&ustconsumer32_data); |
4249 | if (ret != 0) { | |
4250 | PERROR("join_consumer ust32"); | |
4251 | goto error; /* join error, exit without cleanup */ | |
4252 | } | |
4253 | ||
4254 | ret = join_consumer_thread(&ustconsumer64_data); | |
4255 | if (ret != 0) { | |
4256 | PERROR("join_consumer ust64"); | |
4257 | goto error; /* join error, exit without cleanup */ | |
4258 | } | |
4259 | ||
cf3af59e | 4260 | exit_client: |
06f525de DG |
4261 | ret = pthread_join(health_thread, &status); |
4262 | if (ret != 0) { | |
4263 | PERROR("pthread_join health thread"); | |
4264 | goto error; /* join error, exit without cleanup */ | |
4265 | } | |
4266 | ||
44a5e5eb | 4267 | exit_health: |
a88df331 | 4268 | exit: |
cf3af59e MD |
4269 | /* |
4270 | * cleanup() is called when no other thread is running. | |
4271 | */ | |
f6a9efaa | 4272 | rcu_thread_online(); |
cf3af59e | 4273 | cleanup(); |
f6a9efaa DG |
4274 | rcu_thread_offline(); |
4275 | rcu_unregister_thread(); | |
67e40797 | 4276 | if (!ret) { |
cf3af59e | 4277 | exit(EXIT_SUCCESS); |
67e40797 | 4278 | } |
cf3af59e | 4279 | error: |
5e16da05 | 4280 | exit(EXIT_FAILURE); |
fac6795d | 4281 | } |